16% of polygons hit the 500 cap — meaning 73K polygons had their detail reduced. To see uncapped, I can use `--simplify-epsilon 0.1` (0.1m epsilon ≈ no simplification). Let me build that alongside the baseline max-500 for the map, and also add the DP simplify_max version back:


Bash

ssh node3 "
# Build uncapped version (0.1m epsilon = essentially no simplification)
rm -rf /tmp/test-uncapped && mkdir /tmp/test-uncapped
~/build-index-epsilon2 /tmp/test-uncapped ~/pbf/planet.osm.pbf --admin-only --max-admin-level 8 --simplify-epsilon 0.1 > /tmp/uncapped.log 2>&1
grep -E 'Simplif|admin poly|admin index|strings' /tmp/uncapped.log
echo '---'
du -sh /tmp/test-uncapped/
ls -lh /tmp/test-uncapped/admin_vertices.bin
cd /tmp/test-uncapped && tar cf - *.bin | zstd -19 -T0 -q -f -o /tmp/uncapped.tar.zst
ls -lh /tmp/uncapped.tar.zst
echo '---'
# Count vertices
python3 -c \"
import struct
data = open('/tmp/test-uncapped/admin_polygons.bin','rb').read()
vdata = open('/tmp/test-uncapped/admin_vertices.bin','rb').read()
fmt = '<IH2xIB3xfH2x'
n = len(data)//24
total_v = 0
max_v = 0
for i in range(n):
    vo,vc,_,_,_,_ = struct.unpack_from(fmt, data, i*24)
    total_v += vc
    if vc > max_v: max_v = vc
print('Polygons: {:,}'.format(n))
print('Total vertices: {:,} ({:.0f} MiB)'.format(total_v, total_v*8/1024/1024))
print('Max vertices per polygon: {:,}'.format(max_v))
\"
" 2>&1

Build uncapped version


Command running in background with ID: bpxy3iifk. Output is being written to: /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bpxy3iifk.output


for i in $(seq 1 30); do sleep 30; out=$(cat /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bpxy3iifk.output 2>/dev/null); if echo "$out" | grep -q "Max vertices"; then echo "$out"; break; fi; echo "$((i*30))s"; done

Monitor uncapped build


Command running in background with ID: ba21lau4l. Output is being written to: /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/ba21lau4l.output


sleep 600 && cat /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bpxy3iifk.output 2>/dev/null

Check after 10 min


Simplification: error-bounded, fixed 0.1m epsilon
  Added 3876 admin polygons from closed ways.
  Assembling admin polygons in parallel (339801 relations, 1756219 way geometries)...
  459641 admin polygon rings
Waiting for admin polygon S2 covering to complete...
strings.bin: 5124669 bytes (compacted from 210563993)
admin index: 2056426 cells, 459641 polygons
---
2.1G	/tmp/test-uncapped/
-rw-rw-r-- 1 michtest michtest 2.0G Mar 23 18:31 /tmp/test-uncapped/admin_vertices.bin
-rw-rw-r-- 1 michtest michtest 1.1G Mar 23 18:32 /tmp/uncapped.tar.zst
---
Polygons: 459,641
Total vertices: 259,921,540 (1983 MiB)
Max vertices per polygon: 65,535


Uncapped data is in. Now let me generate the map with all versions — uncapped, baseline max-500, and the 4 scale levels:


ssh node3 "python3 << 'PYEOF'
import struct, json, math

# Load UNCAPPED data for the full-detail polygons
admin_data = open('/tmp/test-uncapped/admin_polygons.bin', 'rb').read()
verts_data = open('/tmp/test-uncapped/admin_vertices.bin', 'rb').read()
strings_data = open('/tmp/test-uncapped/strings.bin', 'rb').read()

fmt = '<IH2xIB3xfH2x'
poly_count = len(admin_data) // 24

def get_str(off):
    if off >= len(strings_data): return '???'
    end = strings_data.index(b'\\x00', off)
    return strings_data[off:end].decode('utf-8', errors='replace')

def get_verts(vo, vc):
    out = []
    for j in range(vc):
        lat, lng = struct.unpack_from('<ff', verts_data, (vo+j)*8)
        out.append((float(lat), float(lng)))
    return out

targets = [
    ('France', 2, 47.0, 2.0, 5.0),
    ('Deutschland', 2, 51.0, 10.0, 5.0),
    ('Italia', 2, 42.0, 12.0, 5.0),
    ('Bayern', 4, 48.5, 11.5, 3.0),
    ('Nordrhein-Westfalen', 4, 51.5, 7.5, 3.0),
    ('Berlin', 4, 52.5, 13.4, 1.0),
    ('Greater London', 5, 51.5, -0.1, 2.0),
    ('Roma Capitale', 6, 41.9, 12.5, 2.0),
    ('Paris', 7, 48.85, 2.35, 0.3),
    ('Amsterdam', 8, 52.3, 4.9, 0.5),
    ('Madrid', 8, 40.4, -3.7, 0.5),
]

found = []
for tname, tlevel, tlat, tlng, max_dist in targets:
    best_i = None; best_vc = 0
    for i in range(poly_count):
        vo, vc, name_id, level, area, cc = struct.unpack_from(fmt, admin_data, i*24)
        if level != tlevel: continue
        if get_str(name_id) != tname: continue
        pts = get_verts(vo, vc)
        clat = sum(p[0] for p in pts)/len(pts)
        clng = sum(p[1] for p in pts)/len(pts)
        dist = ((clat-tlat)**2 + (clng-tlng)**2)**0.5
        if dist < max_dist and vc > best_vc:
            best_vc = vc; best_i = i
    if best_i is not None:
        vo, vc, name_id, level, area, cc = struct.unpack_from(fmt, admin_data, best_i*24)
        v = get_verts(vo, vc)
        found.append({'name': get_str(name_id), 'level': level, 'verts': v})
        print('{} L{}: {} uncapped verts'.format(get_str(name_id), level, len(v)))

def dp_dist(p, a, b):
    dx, dy = b[0]-a[0], b[1]-a[1]
    lsq = dx*dx+dy*dy
    if lsq == 0: return math.sqrt((p[0]-a[0])**2+(p[1]-a[1])**2)
    t = max(0, min(1, ((p[0]-a[0])*dx+(p[1]-a[1])*dy)/lsq))
    return math.sqrt((a[0]+t*dx-p[0])**2 + (a[1]+t*dy-p[1])**2)

def dp_simplify_eps(pts, eps):
    if len(pts) <= 4: return pts
    keep = [False]*len(pts); keep[0]=keep[-1]=True
    stk = [(0, len(pts)-1)]
    while stk:
        s,e = stk.pop()
        if e<=s+1: continue
        md, mi = 0, s
        for i in range(s+1,e):
            d = dp_dist(pts[i], pts[s], pts[e])
            if d>md: md,mi=d,i
        if md>eps: keep[mi]=True; stk.append((s,mi)); stk.append((mi,e))
    return [p for p,k in zip(pts,keep) if k]

def dp_simplify_max(pts, max_v):
    if len(pts) <= max_v: return pts
    lo, hi = 0.0, 1.0
    for _ in range(20):
        eps = (lo+hi)/2
        keep = [False]*len(pts); keep[0]=keep[-1]=True
        stk = [(0,len(pts)-1)]
        while stk:
            s,e=stk.pop()
            if e<=s+1: continue
            md,mi=0,s
            for i in range(s+1,e):
                d=dp_dist(pts[i],pts[s],pts[e])
                if d>md: md,mi=d,i
            if md>eps: keep[mi]=True;stk.append((s,mi));stk.append((mi,e))
        cnt=sum(keep)
        if cnt>max_v: lo=eps
        else: hi=eps
    keep=[False]*len(pts);keep[0]=keep[-1]=True
    stk=[(0,len(pts)-1)]
    while stk:
        s,e=stk.pop()
        if e<=s+1: continue
        md,mi=0,s
        for i in range(s+1,e):
            d=dp_dist(pts[i],pts[s],pts[e])
            if d>md: md,mi=d,i
        if md>hi: keep[mi]=True;stk.append((s,mi));stk.append((mi,e))
    return [p for p,k in zip(pts,keep) if k]

def meters_to_deg(m, lat):
    c = math.cos(lat * math.pi / 180.0)
    if c < 0.01: c = 0.01
    return m / (111320.0 * c)

defaults = {2:500, 3:200, 4:100, 5:50, 6:30, 7:20, 8:15}

modes = [
    ('Uncapped (2.1GB)', 'uncapped', '#000000'),
    ('Max 500 baseline (509MB)', 'max500', '#888888'),
    ('1.0x epsilon (354MB)', 1.0, '#e41a1c'),
    ('1.5x epsilon (294MB)', 1.5, '#0066ff'),
    ('2.0x epsilon (256MB)', 2.0, '#00cc44'),
    ('2.5x epsilon (228MB)', 2.5, '#ff8800'),
]

features = []
for city in found:
    pts = city['verts']
    level = city['level']
    label = '{} (L{})'.format(city['name'], level)
    base_eps = defaults.get(level, 15)

    for mname, mval, color in modes:
        if mval == 'uncapped':
            sp = pts  # no simplification
        elif mval == 'max500':
            sp = dp_simplify_max(pts, 500)
        else:
            eps_m = base_eps * mval
            eps_d = meters_to_deg(eps_m, pts[0][0])
            sp = dp_simplify_eps(pts, eps_d)

        coords = [[p[1], p[0]] for p in sp]
        if coords[0] != coords[-1]: coords.append(coords[0])

        if mval == 'uncapped':
            detail = 'Uncapped ({} verts)'.format(len(sp))
        elif mval == 'max500':
            detail = 'Max 500 ({} verts)'.format(len(sp))
        else:
            detail = '{}x (L{} = {:.0f}m, {} verts)'.format(mval, level, base_eps*mval, len(sp))

        features.append({
            'type': 'Feature',
            'properties': {
                'name': label, 'level': level,
                'mode': mname,
                'mode_detail': detail,
                'actual_verts': len(sp),
                'color': color
            },
            'geometry': {'type': 'Polygon', 'coordinates': [coords]}
        })

geojson = {'type': 'FeatureCollection', 'features': features}
with open('/home/michtest/test-cities-compact/comparison.geojson', 'w') as f:
    json.dump(geojson, f)
print('Wrote {} features for {} cities'.format(len(features), len(found)))
PYEOF" 2>&1

Generate GeoJSON from uncapped data with all modes


France L2: 60214 uncapped verts
Deutschland L2: 65535 uncapped verts
Italia L2: 57986 uncapped verts
Bayern L4: 65535 uncapped verts
Nordrhein-Westfalen L4: 39583 uncapped verts
Berlin L4: 4511 uncapped verts
Greater London L5: 9514 uncapped verts
Roma Capitale L6: 10607 uncapped verts
Paris L7: 608 uncapped verts
Amsterdam L8: 1874 uncapped verts
Madrid L8: 1660 uncapped verts
Wrote 66 features for 11 cities


Interesting — Deutschland and Bayern hit the uint16 max (65,535 vertices!). France has 60K. Now rebuild the viewer:


ssh node3 "python3 -c \"
html = open('/home/michtest/simplification_map.html').read()
geojson = open('/home/michtest/test-cities-compact/comparison.geojson').read()
html = html.replace('GEOJSON_PLACEHOLDER', geojson)
open('/home/michtest/simplification_viewer.html', 'w').write(html)
print(len(html))
\"" 2>&1 && scp node3:~/simplification_viewer.html /root/traccar-geocoder/builder/tools/ 2>&1 && echo "Updated"

Rebuild viewer


14231501
Updated


Refresh **http://100.68.107.4:8080/simplification_viewer.html**

Now shows 6 modes for each city:

- **Black** = Uncapped / raw OSM (2.1 GiB uncompressed, 1.1 GiB compressed) — up to 65K vertices per polygon
- **Grey** = Max 500 baseline (883 MiB / 509 MiB compressed)
- **Red** = 1.0x epsilon (555 MiB / 354 MiB compressed)
- **Blue** = 1.5x epsilon (459 MiB / 294 MiB compressed)
- **Green** = 2.0x epsilon (399 MiB / 256 MiB compressed)
- **Orange** = 2.5x epsilon (359 MiB / 228 MiB compressed)

The uncapped version is most dramatic on countries — France has 60K vertices tracing every river bend and coastline cove. Zoom into the French Atlantic coast or the Italian coastline to see the massive difference between uncapped black and the simplified versions. For cities like Paris (608 raw verts) there's barely any difference at any level.

The complete size comparison:

| Mode | Uncompressed | Compressed | Max boundary error |
|---|---|---|---|
| Uncapped | 2.1 GiB | 1.1 GiB | 0 (exact OSM) |
| Max 500 | 883 MiB | 509 MiB | Variable |
| 1.0x epsilon | 555 MiB | 354 MiB | 15-500m |
| 1.5x epsilon | 459 MiB | 294 MiB | 22-750m |
| 2.0x epsilon | 399 MiB | 256 MiB | 30-1000m |
| 2.5x epsilon | 359 MiB | 228 MiB | 38-1250m |


<task-notification>
<task-id>bpxy3iifk</task-id>
<tool-use-id>toolu_01F2C4y9KrFKEdfUrGzYLmCu</tool-use-id>
<output-file>/tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bpxy3iifk.output</output-file>
<status>completed</status>
<summary>Background command "Build uncapped version" completed (exit code 0)</summary>
</task-notification>
Read the output file to retrieve the result: /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/bpxy3iifk.output


<task-notification>
<task-id>ba21lau4l</task-id>
<tool-use-id>toolu_01Jpwed8xxYzzdvzNBomW6A3</tool-use-id>
<output-file>/tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/ba21lau4l.output</output-file>
<status>completed</status>
<summary>Background command "Monitor uncapped build" completed (exit code 0)</summary>
</task-notification>
Read the output file to retrieve the result: /tmp/claude-0/-root-traccar-geocoder/af1c4baa-0f9a-4420-a8b3-ce20dc28c8b9/tasks/ba21lau4l.output


Already handled — uncapped build completed with 259M vertices (2.1 GiB), map viewer updated with all 6 modes. Results reported above.


On the visualisation Bayern and Deutscheland seem to be mixed and the polygons have an extremely weird shape, is this a glitch on the visualisation or is this a wider issue?


ssh node3 "python3 << 'PYEOF'
import struct

admin_data = open('/tmp/test-uncapped/admin_polygons.bin', 'rb').read()
verts_data = open('/tmp/test-uncapped/admin_vertices.bin', 'rb').read()
strings_data = open('/tmp/test-uncapped/strings.bin', 'rb').read()

fmt = '<IH2xIB3xfH2x'
poly_count = len(admin_data) // 24

def get_str(off):
    if off >= len(strings_data): return '???'
    end = strings_data.index(b'\\x00', off)
    return strings_data[off:end].decode('utf-8', errors='replace')

# Find Deutschland and Bayern
for tname, tlevel in [('Deutschland', 2), ('Bayern', 4)]:
    for i in range(poly_count):
        vo, vc, name_id, level, area, cc = struct.unpack_from(fmt, admin_data, i*24)
        if level != tlevel or get_str(name_id) != tname: continue
        # Check vertex_count vs actual available
        max_possible = (len(verts_data) // 8) - vo
        print('{} L{}: vertex_offset={}, vertex_count={}, max_possible_from_offset={}'.format(
            tname, level, vo, vc, max_possible))

        # Check if vertex_count hit uint16 max
        if vc == 65535:
            print('  WARNING: hit uint16_t max (65535) - polygon was TRUNCATED!')

        # Sample first and last few vertices to check sanity
        for j in [0, 1, 2, vc//2, vc-2, vc-1]:
            if j < vc:
                lat, lng = struct.unpack_from('<ff', verts_data, (vo+j)*8)
                print('  vert[{}]: ({:.4f}, {:.4f})'.format(j, lat, lng))

        # Check if ring is closed
        lat0, lng0 = struct.unpack_from('<ff', verts_data, vo*8)
        latN, lngN = struct.unpack_from('<ff', verts_data, (vo+vc-1)*8)
        closed = abs(lat0-latN) < 0.001 and abs(lng0-lngN) < 0.001
        print('  Ring closed: {} (first=({:.4f},{:.4f}) last=({:.4f},{:.4f}))'.format(
            closed, lat0, lng0, latN, lngN))
        print()
PYEOF" 2>&1

Inspect Deutschland and Bayern polygons


Deutschland L2: vertex_offset=206665831, vertex_count=65535, max_possible_from_offset=55263632
  WARNING: hit uint16_t max (65535) - polygon was TRUNCATED!
  vert[0]: (47.2701, 10.1783)
  vert[1]: (47.2702, 10.1740)
  vert[2]: (47.2717, 10.1740)
  vert[32767]: (51.8924, 6.1146)
  vert[65533]: (50.5038, 13.1960)
  vert[65534]: (50.5037, 13.1960)
  Ring closed: False (first=(47.2701,10.1783) last=(50.5037,13.1960))

Deutschland L2: vertex_offset=206803612, vertex_count=471, max_possible_from_offset=55125851
  vert[0]: (50.5361, 6.1957)
  vert[1]: (50.5361, 6.1969)
  vert[2]: (50.5363, 6.1974)
  vert[235]: (50.5738, 6.2060)
  vert[469]: (50.5368, 6.1942)
  vert[470]: (50.5361, 6.1957)
  Ring closed: True (first=(50.5361,6.1957) last=(50.5361,6.1957))

Deutschland L2: vertex_offset=206804083, vertex_count=496, max_possible_from_offset=55125380
  vert[0]: (50.6238, 6.1818)
  vert[1]: (50.6238, 6.1817)
  vert[2]: (50.6244, 6.1802)
  vert[248]: (50.6480, 6.2272)
  vert[494]: (50.6269, 6.1861)
  vert[495]: (50.6238, 6.1818)
  Ring closed: True (first=(50.6238,6.1818) last=(50.6238,6.1818))

Deutschland L2: vertex_offset=206804579, vertex_count=190, max_possible_from_offset=55124884
  vert[0]: (47.6849, 8.6700)
  vert[1]: (47.6849, 8.6707)
  vert[2]: (47.6853, 8.6722)
  vert[95]: (47.7152, 8.7013)
  vert[188]: (47.6849, 8.6688)
  vert[189]: (47.6849, 8.6700)
  Ring closed: True (first=(47.6849,8.6700) last=(47.6849,8.6700))

Deutschland L2: vertex_offset=206804769, vertex_count=55, max_possible_from_offset=55124694
  vert[0]: (50.5209, 6.2020)
  vert[1]: (50.5209, 6.2029)
  vert[2]: (50.5210, 6.2052)
  vert[27]: (50.5293, 6.1901)
  vert[53]: (50.5209, 6.2017)
  vert[54]: (50.5209, 6.2020)
  Ring closed: True (first=(50.5209,6.2020) last=(50.5209,6.2020))

Deutschland L2: vertex_offset=206804824, vertex_count=120, max_possible_from_offset=55124639
  vert[0]: (50.6479, 6.1839)
  vert[1]: (50.6480, 6.1840)
  vert[2]: (50.6482, 6.1841)
  vert[60]: (50.6642, 6.1901)
  vert[118]: (50.6480, 6.1838)
  vert[119]: (50.6479, 6.1839)
  Ring closed: True (first=(50.6479,6.1839) last=(50.6479,6.1839))

Deutschland L2: vertex_offset=206804944, vertex_count=20, max_possible_from_offset=55124519
  vert[0]: (50.5968, 6.2482)
  vert[1]: (50.5977, 6.2485)
  vert[2]: (50.5979, 6.2485)
  vert[10]: (50.5982, 6.2470)
  vert[18]: (50.5970, 6.2474)
  vert[19]: (50.5968, 6.2482)
  Ring closed: True (first=(50.5968,6.2482) last=(50.5968,6.2482))

Deutschland L2: vertex_offset=206804964, vertex_count=7, max_possible_from_offset=55124499
  vert[0]: (54.0068, 7.4087)
  vert[1]: (54.0198, 7.5000)
  vert[2]: (54.0268, 7.5498)
  vert[3]: (54.0815, 7.5000)
  vert[5]: (54.1357, 7.4087)
  vert[6]: (54.0068, 7.4087)
  Ring closed: True (first=(54.0068,7.4087) last=(54.0068,7.4087))

Bayern L4: vertex_offset=238849454, vertex_count=65535, max_possible_from_offset=23080009
  WARNING: hit uint16_t max (65535) - polygon was TRUNCATED!
  vert[0]: (47.2701, 10.1783)
  vert[1]: (47.2709, 10.1795)
  vert[2]: (47.2710, 10.1801)
  vert[32767]: (48.7549, 13.8218)
  vert[65533]: (50.4249, 11.4450)
  vert[65534]: (50.4251, 11.4451)
  Ring closed: False (first=(47.2701,10.1783) last=(50.4251,11.4451))


Found the bug. Both Deutschland and Bayern hit the **`uint16_t vertex_count` overflow** at 65,535. The `AdminPolygon.vertex_count` field is `uint16_t` — it can only store up to 65,535. The uncapped polygons have far more vertices than that, so:

1. The vertex count wraps/truncates to 65,535
2. The ring is not closed (truncated mid-boundary)
3. The visualisation draws a line from the truncation point back to the start, creating the weird shape

This is a **data format limitation**, not a visualisation bug. The `vertex_count` field in `AdminPolygon` is too small for uncapped polygons. With the max-500 or epsilon simplification this never triggers because all polygons stay well under 65K vertices.

For the visualisation, this only affects the uncapped mode. The simplified versions are all correct. The fix for uncapped would be to change `vertex_count` from `uint16_t` to `uint32_t` in the struct, but that would change the binary format and require server-side changes too.

For now, the uncapped version is only useful as a reference — the simplified versions are what we'd actually deploy. Should I note this limitation in the viewer, or would you rather I fix the struct to support uncapped properly?


It seems that all of the other modes have this issue too in the viewer


You're right — the Python simplification in the viewer script takes the already-truncated 65,535 vertices as input, so all modes inherit the broken polygon. Let me fix the GeoJSON export to skip polygons that hit the uint16 cap:


[Request interrupted by user]


Just add support to the viewer to use larger ints


    30→struct AdminPolygon {
    31→    uint32_t vertex_offset;
    32→    uint16_t vertex_count;
    33→    uint32_t name_id;
    34→    uint8_t admin_level;
    35→    float area;
    36→    uint16_t country_code;
    37→};
    38→
    39→struct NodeCoord {

struct AdminPolygon {
    uint32_t vertex_offset;
    uint16_t vertex_count;
    uint32_t name_id;
    uint8_t admin_level;
    float area;
    uint16_t country_code;
};

struct NodeCoord {


The struct uses `uint16_t vertex_count` which caps at 65,535. I need to change it to `uint32_t`. This changes the struct size from 24 to 28 bytes (with padding). Let me check where the struct is read:


builder/src/types.h:32:    uint16_t vertex_count;
builder/src/types.h:62:static constexpr int    MAX_VERTEX_COUNT        = 65535; // uint16_t vertex_count
builder/src/s2_helpers.cpp:278:    poly.vertex_count = static_cast<uint16_t>(std::min(simplified.size(), size_t(MAX_VERTEX_COUNT)));
builder/src/build_index.cpp:951:                        poly.vertex_count = static_cast<uint16_t>(std::min(pp.simplified.size(), size_t(MAX_VERTEX_COUNT)));
builder/src/continent_filter.cpp:114:          for (uint16_t v = 0; v < ap.vertex_count; v++)


Also need to check the Rust server:


66:    vertex_count: u16,
469:                    let count = poly.vertex_count as usize;


    60→}
    61→
    62→#[repr(C)]
    63→#[derive(Clone, Copy)]
    64→struct AdminPolygon {
    65→    vertex_offset: u32,
    66→    vertex_count: u16,
    67→    name_id: u32,
    68→    admin_level: u8,
    69→    area: f32,
    70→    country_code: u16,
    71→}
    72→
    73→#[repr(C)]
    74→#[derive(Clone, Copy)]

}

#[repr(C)]
#[derive(Clone, Copy)]
struct AdminPolygon {
    vertex_offset: u32,
    vertex_count: u16,
    name_id: u32,
    admin_level: u8,
    area: f32,
    country_code: u16,
}

#[repr(C)]
#[derive(Clone, Copy)]


Need to update both C++ and Rust. Let me do it:


Edit

struct AdminPolygon {
    uint32_t vertex_offset;
    uint16_t vertex_count;
    uint32_t name_id;
    uint8_t admin_level;
    float area;
    uint16_t country_code;
};

struct AdminPolygon {
    uint32_t vertex_offset;
    uint32_t vertex_count;
    uint32_t name_id;
    uint8_t admin_level;
    float area;
    uint16_t country_code;
};


The file /root/traccar-geocoder/builder/src/types.h has been updated successfully.

struct AdminPolygon {
    uint32_t vertex_offset;
    uint32_t vertex_count;
    uint32_t name_id;
    uint8_t admin_level;
    float area;
    uint16_t country_code;
};

#pragma once

#include <cstdint>
#include <vector>

// --- Binary format structs (must match server's index reader) ---

struct WayHeader {
    uint32_t node_offset;
    uint8_t node_count;
    uint32_t name_id;
};

struct AddrPoint {
    float lat;
    float lng;
    uint32_t housenumber_id;
    uint32_t street_id;
};

struct InterpWay {
    uint32_t node_offset;
    uint8_t node_count;
    uint32_t street_id;
    uint32_t start_number;
    uint32_t end_number;
    uint8_t interpolation;
};

struct AdminPolygon {
    uint32_t vertex_offset;
    uint16_t vertex_count;
    uint32_t name_id;
    uint8_t admin_level;
    float area;
    uint16_t country_code;
};

struct NodeCoord {
    float lat;
    float lng;
};

// Sorted cell-item pair for direct entry writing (avoids hash map)
struct CellItemPair {
    uint64_t cell_id;
    uint32_t item_id;
};

// --- Constants ---

static const uint32_t INTERIOR_FLAG = 0x80000000u;
static const uint32_t ID_MASK       = 0x7FFFFFFFu;
static const uint32_t NO_DATA       = 0xFFFFFFFFu;

// Simplification mode
enum class SimplifyMode { MaxVertices, ErrorBounded };

// Processing limits
static constexpr size_t MAX_BLOCK_QUEUE         = 64;    // producer-consumer queue depth
static constexpr int    MAX_NODE_COUNT          = 255;   // uint8_t node_count
static constexpr int    MAX_VERTEX_COUNT        = 65535; // uint16_t vertex_count
static constexpr int    MAX_S2_CELLS_PER_POLY   = 200;   // S2RegionCoverer max_cells
static constexpr int    BACKTRACK_CALL_BUDGET   = 100000; // per-ring backtracking limit
static constexpr int    BACKTRACK_TOTAL_BUDGET  = 500000; // per-relation backtracking limit
static constexpr int    BACKTRACK_MAX_DEPTH     = 200;    // recursion depth limit
static constexpr size_t MAX_SUBWAYS_FOR_RETRY   = 30;     // only retry small relations
static constexpr size_t MAX_NODE_ID_DEFAULT     = 15000000000ULL; // dense index capacity

// --- Index mode ---

enum class IndexMode { Full, NoAddresses, AdminOnly };

// --- Deferred S2 work items ---

struct DeferredWay {
    uint32_t way_id;
    uint32_t node_offset;
    uint8_t node_count;
};

struct DeferredInterp {
    uint32_t interp_id;
    uint32_t node_offset;
    uint8_t node_count;
};

// Collected relation data for parallel admin assembly
struct CollectedRelation {
    int64_t id;
    uint8_t admin_level;
    std::string name;
    std::string country_code;
    bool is_postal;
    std::vector<std::pair<int64_t, std::string>> members; // (way_id, role)
};

struct AdminPolygon {
uint32_t vertex_offset;
-    uint16_t vertex_count;
+    uint32_t vertex_count;
uint32_t name_id;
uint8_t admin_level;
float area;


static constexpr int    MAX_VERTEX_COUNT        = 65535; // uint16_t vertex_count

static constexpr int    MAX_VERTEX_COUNT        = 0x7FFFFFFF; // uint32_t vertex_count


#pragma once

#include <cstdint>
#include <vector>

// --- Binary format structs (must match server's index reader) ---

struct WayHeader {
    uint32_t node_offset;
    uint8_t node_count;
    uint32_t name_id;
};

struct AddrPoint {
    float lat;
    float lng;
    uint32_t housenumber_id;
    uint32_t street_id;
};

struct InterpWay {
    uint32_t node_offset;
    uint8_t node_count;
    uint32_t street_id;
    uint32_t start_number;
    uint32_t end_number;
    uint8_t interpolation;
};

struct AdminPolygon {
    uint32_t vertex_offset;
    uint32_t vertex_count;
    uint32_t name_id;
    uint8_t admin_level;
    float area;
    uint16_t country_code;
};

struct NodeCoord {
    float lat;
    float lng;
};

// Sorted cell-item pair for direct entry writing (avoids hash map)
struct CellItemPair {
    uint64_t cell_id;
    uint32_t item_id;
};

// --- Constants ---

static const uint32_t INTERIOR_FLAG = 0x80000000u;
static const uint32_t ID_MASK       = 0x7FFFFFFFu;
static const uint32_t NO_DATA       = 0xFFFFFFFFu;

// Simplification mode
enum class SimplifyMode { MaxVertices, ErrorBounded };

// Processing limits
static constexpr size_t MAX_BLOCK_QUEUE         = 64;    // producer-consumer queue depth
static constexpr int    MAX_NODE_COUNT          = 255;   // uint8_t node_count
static constexpr int    MAX_VERTEX_COUNT        = 65535; // uint16_t vertex_count
static constexpr int    MAX_S2_CELLS_PER_POLY   = 200;   // S2RegionCoverer max_cells
static constexpr int    BACKTRACK_CALL_BUDGET   = 100000; // per-ring backtracking limit
static constexpr int    BACKTRACK_TOTAL_BUDGET  = 500000; // per-relation backtracking limit
static constexpr int    BACKTRACK_MAX_DEPTH     = 200;    // recursion depth limit
static constexpr size_t MAX_SUBWAYS_FOR_RETRY   = 30;     // only retry small relations
static constexpr size_t MAX_NODE_ID_DEFAULT     = 15000000000ULL; // dense index capacity

// --- Index mode ---

enum class IndexMode { Full, NoAddresses, AdminOnly };

// --- Deferred S2 work items ---

struct DeferredWay {
    uint32_t way_id;
    uint32_t node_offset;
    uint8_t node_count;
};

struct DeferredInterp {
    uint32_t interp_id;
    uint32_t node_offset;
    uint8_t node_count;
};

// Collected relation data for parallel admin assembly
struct CollectedRelation {
    int64_t id;
    uint8_t admin_level;
    std::string name;
    std::string country_code;
    bool is_postal;
    std::vector<std::pair<int64_t, std::string>> members; // (way_id, role)
};

-static constexpr int    MAX_VERTEX_COUNT        = 65535; // uint16_t vertex_count

+static constexpr int    MAX_VERTEX_COUNT        = 0x7FFFFFFF; // uint32_t vertex_count


Now fix the casts:


poly.vertex_count = static_cast<uint16_t>(std::min(simplified.size(), size_t(MAX_VERTEX_COUNT)));


The file /root/traccar-geocoder/builder/src/s2_helpers.cpp has been updated successfully.

#include "s2_helpers.h"
#include "geometry.h"

#include <algorithm>
#include <cmath>
#include <iostream>
#include <memory>

#include <s2/s2latlng.h>
#include <s2/s2region_coverer.h>
#include <s2/s2polyline.h>
#include <s2/s2polygon.h>
#include <s2/s2loop.h>

// --- S2 cell level globals ---

int kStreetCellLevel = 17;
int kAdminCellLevel = 10;
int kMaxAdminLevel = 0;  // 0 means no filtering

SimplifyMode kSimplifyMode = SimplifyMode::MaxVertices;
double kSimplifyEpsilonOverride = 0;

// --- cover_edge ---

void cover_edge(double lat1, double lng1, double lat2, double lng2,
                std::vector<S2CellId>& out) {
    out.clear();

    S2CellId c1 = S2CellId(S2LatLng::FromDegrees(lat1, lng1)).parent(kStreetCellLevel);
    S2CellId c2 = S2CellId(S2LatLng::FromDegrees(lat2, lng2)).parent(kStreetCellLevel);

    // Same cell — most common case for short edges
    if (c1 == c2) {
        out.push_back(c1);
        return;
    }

    // Adjacent cells — check midpoint
    S2CellId cm = S2CellId(S2LatLng::FromDegrees((lat1+lat2)/2, (lng1+lng2)/2)).parent(kStreetCellLevel);
    if (cm == c1 || cm == c2) {
        out.push_back(c1);
        out.push_back(c2);
        return;
    }

    // Longer edge — use S2RegionCoverer for correctness (handles geodesic curves)
    thread_local S2RegionCoverer coverer = []() {
        S2RegionCoverer::Options options;
        options.set_fixed_level(kStreetCellLevel);
        return S2RegionCoverer(options);
    }();

    S2Point p1 = S2LatLng::FromDegrees(lat1, lng1).ToPoint();
    S2Point p2 = S2LatLng::FromDegrees(lat2, lng2).ToPoint();
    if (p1 == p2) { out.push_back(c1); return; }

    std::vector<S2Point> points = {p1, p2};
    S2Polyline polyline(points);
    S2CellUnion covering = coverer.GetCovering(polyline);
    out = std::move(covering.cell_ids());
}

std::vector<S2CellId> cover_edge(double lat1, double lng1, double lat2, double lng2) {
    std::vector<S2CellId> result;
    cover_edge(lat1, lng1, lat2, lng2, result);
    return result;
}

S2CellId point_to_cell(double lat, double lng) {
    return S2CellId(S2LatLng::FromDegrees(lat, lng)).parent(kStreetCellLevel);
}

// --- cover_polygon ---

std::vector<std::pair<S2CellId, bool>> cover_polygon(
    const std::vector<std::pair<double,double>>& vertices) {
    std::vector<S2Point> points;
    points.reserve(vertices.size());
    for (const auto& [lat, lng] : vertices) {
        S2Point p = S2LatLng::FromDegrees(lat, lng).ToPoint();
        if (!points.empty() && points.back() == p) continue;
        points.push_back(p);
    }
    if (points.size() > 1 && points.front() == points.back()) {
        points.pop_back();
    }
    if (points.size() < 3) return {};

    S2Error error;
    auto loop = std::make_unique<S2Loop>(points, S2Debug::DISABLE);
    loop->Normalize();
    if (loop->FindValidationError(&error)) return {};

    S2Polygon polygon(std::move(loop));

    S2RegionCoverer::Options options;
    options.set_max_level(kAdminCellLevel);
    options.set_max_cells(MAX_S2_CELLS_PER_POLY);

    S2RegionCoverer coverer(options);
    S2CellUnion covering = coverer.GetCovering(polygon);
    S2CellUnion interior = coverer.GetInteriorCovering(polygon);

    std::unordered_set<uint64_t> interior_set;
    for (const auto& cell : interior.cell_ids()) {
        if (cell.level() <= kAdminCellLevel) {
            auto begin = cell.range_min().parent(kAdminCellLevel);
            auto end = cell.range_max().parent(kAdminCellLevel);
            for (auto c = begin; c != end; c = c.next()) {
                interior_set.insert(c.id());
            }
            interior_set.insert(end.id());
        } else {
            interior_set.insert(cell.parent(kAdminCellLevel).id());
        }
    }

    std::vector<std::pair<S2CellId, bool>> result;
    for (const auto& cell : covering.cell_ids()) {
        if (cell.level() <= kAdminCellLevel) {
            auto begin = cell.range_min().parent(kAdminCellLevel);
            auto end = cell.range_max().parent(kAdminCellLevel);
            for (auto c = begin; c != end; c = c.next()) {
                result.emplace_back(c, interior_set.count(c.id()) > 0);
            }
            result.emplace_back(end, interior_set.count(end.id()) > 0);
        } else {
            auto parent = cell.parent(kAdminCellLevel);
            result.emplace_back(parent, interior_set.count(parent.id()) > 0);
        }
    }

    std::sort(result.begin(), result.end(), [](const auto& a, const auto& b) {
        return a.first < b.first;
    });
    auto it = result.begin();
    for (auto curr = result.begin(); curr != result.end(); ) {
        auto next = curr + 1;
        bool is_interior = curr->second;
        while (next != result.end() && next->first == curr->first) {
            is_interior = is_interior || next->second;
            ++next;
        }
        *it = {curr->first, is_interior};
        ++it;
        curr = next;
    }
    result.erase(it, result.end());
    return result;
}

// --- AdminCoverPool ---

AdminCoverPool::AdminCoverPool(size_t num_threads) : stop_(false) {
    for (size_t i = 0; i < num_threads; i++) {
        workers_.emplace_back([this]() { worker_loop(); });
    }
}

AdminCoverPool::~AdminCoverPool() {
    {
        std::lock_guard<std::mutex> lock(mutex_);
        stop_ = true;
    }
    cv_.notify_all();
    for (auto& t : workers_) t.join();
}

void AdminCoverPool::submit(uint32_t poly_id, std::vector<std::pair<double,double>>&& vertices) {
    {
        std::lock_guard<std::mutex> lock(mutex_);
        queue_.push_back({poly_id, std::move(vertices)});
    }
    cv_.notify_one();
}

std::unordered_map<uint64_t, std::vector<uint32_t>> AdminCoverPool::drain() {
    {
        std::unique_lock<std::mutex> lock(mutex_);
        done_cv_.wait(lock, [this]() { return queue_.empty() && active_workers_ == 0; });
    }
    std::unordered_map<uint64_t, std::vector<uint32_t>> merged;
    for (auto& local : thread_results_) {
        for (auto& [cell_id, ids] : local) {
            auto& target = merged[cell_id];
            target.insert(target.end(), ids.begin(), ids.end());
        }
    }
    return merged;
}

void AdminCoverPool::worker_loop() {
    size_t my_idx;
    {
        std::lock_guard<std::mutex> lock(mutex_);
        my_idx = thread_results_.size();
        thread_results_.emplace_back();
    }

    while (true) {
        WorkItem item;
        {
            std::unique_lock<std::mutex> lock(mutex_);
            cv_.wait(lock, [this]() { return stop_ || !queue_.empty(); });
            if (stop_ && queue_.empty()) return;
            item = std::move(queue_.front());
            queue_.pop_front();
            active_workers_++;
        }

        auto cell_ids = cover_polygon(item.vertices);
        auto& local = thread_results_[my_idx];
        for (const auto& [cell_id, is_interior] : cell_ids) {
            uint32_t entry = is_interior ? (item.poly_id | INTERIOR_FLAG) : item.poly_id;
            local[cell_id.id()].push_back(entry);
        }

        {
            std::lock_guard<std::mutex> lock(mutex_);
            active_workers_--;
        }
        done_cv_.notify_all();
    }
}

// --- add_addr_point ---

void add_addr_point(ParsedData& data, double lat, double lng,
                    const char* housenumber, const char* street,
                    uint64_t& addr_count_total) {
    uint32_t addr_id = static_cast<uint32_t>(data.addr_points.size());
    data.addr_points.push_back({
        static_cast<float>(lat),
        static_cast<float>(lng),
        data.string_pool.intern(housenumber),
        data.string_pool.intern(street)
    });

    S2CellId cell = point_to_cell(lat, lng);
    data.cell_to_addrs[cell.id()].push_back(addr_id);

    addr_count_total++;
    if (addr_count_total % 1000000 == 0) {
        std::cerr << "Collected " << addr_count_total / 1000000 << "M addresses..." << std::endl;
    }
}

// --- add_admin_polygon ---

void add_admin_polygon(ParsedData& data,
                       const std::vector<std::pair<double,double>>& vertices_in,
                       const char* name, uint8_t admin_level,
                       const char* country_code,
                       AdminCoverPool* admin_pool) {
    auto vertices = vertices_in;
    if (vertices.size() >= 4 &&
        std::fabs(vertices.front().first - vertices.back().first) < 1e-7 &&
        std::fabs(vertices.front().second - vertices.back().second) < 1e-7) {
        vertices.pop_back();
        auto min_it = std::min_element(vertices.begin(), vertices.end());
        std::rotate(vertices.begin(), min_it, vertices.end());
        vertices.push_back(vertices.front());
    }

    auto simplified = simplify_admin_polygon(vertices, admin_level);
    if (simplified.size() < 3) return;

    uint32_t poly_id = static_cast<uint32_t>(data.admin_polygons.size());
    uint32_t vertex_offset = static_cast<uint32_t>(data.admin_vertices.size());

    for (const auto& [lat, lng] : simplified) {
        data.admin_vertices.push_back({static_cast<float>(lat), static_cast<float>(lng)});
    }

    AdminPolygon poly{};
    poly.vertex_offset = vertex_offset;
    poly.vertex_count = static_cast<uint16_t>(std::min(simplified.size(), size_t(MAX_VERTEX_COUNT)));
    poly.name_id = data.string_pool.intern(name);
    poly.admin_level = admin_level;
    poly.area = polygon_area(simplified);
    poly.country_code = (country_code && country_code[0] && country_code[1])
        ? static_cast<uint16_t>((country_code[0] << 8) | country_code[1])
        : 0;
    data.admin_polygons.push_back(poly);

    if (admin_pool) {
        admin_pool->submit(poly_id, std::move(simplified));
    }
}

-    poly.vertex_count = static_cast<uint16_t>(std::min(simplified.size(), size_t(MAX_VERTEX_COUNT)));

+    poly.vertex_count = static_cast<uint32_t>(simplified.size());


poly.vertex_count = static_cast<uint16_t>(std::min(pp.simplified.size(), size_t(MAX_VERTEX_COUNT)));