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Merged
bertt merged 3 commits into from
Oct 30, 2025
Merged

add cartesian coordinates support #95

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996c9c0
add cartesian coordinates support
bertt Oct 30, 2025
aa6a3cd
update readme
bertt Oct 30, 2025
bfdf69a
update reade
bertt Oct 30, 2025
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20 changes: 18 additions & 2 deletions README.md
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Expand Up @@ -54,7 +54,7 @@ https://geodan.github.io/i3dm.export/samples/traffic_lights/cesium/

Input database table contains following columns:

. geom - geometry with Point or PointZ (for example epsg:4326) for i3dm positions;
. geom - geometry with Point or PointZ for instance positions;

. scale - double with instance scale (all directions);

Expand Down Expand Up @@ -103,7 +103,23 @@ Tool parameters:

```

# Docker
## Projection support

The input table can defined in

1] Global coordinates

WGS84 longitude, latitude in degrees + height in meters with ellipsoid as reference (EPSG:4979)

2] Local coordinates (for release 2.12.0 and higher)

Any projected coordinate system height in meters with geoid as reference

For example in the Netherlands use composite EPSG:7415 (Amersfoort / RD New (EPSG:28992) + NAP height in meters (EPSG:5709)).

On runtime the tool will reproject the instance positions to EPSG:4978 (ECEF coordinates) for creating the 3D tiles.

## Docker

See https://hub.docker.com/r/geodan/i3dm.export

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2 changes: 1 addition & 1 deletion src/InstancesRepository.cs
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Expand Up @@ -65,7 +65,7 @@ public static (BoundingBox bbox, double zmin, double zmax) GetBoundingBoxForTabl
conn.Open();
var q = string.IsNullOrEmpty(query) ? "" : $"where {query}";

var sql = $"SELECT st_xmin(box), ST_Ymin(box), ST_Xmax(box), ST_Ymax(box), ST_Zmin(box), ST_Zmax(box) FROM (select st_3dextent({geometry_column}) AS box from {geometry_table} {q}) as total";
var sql = $"SELECT st_xmin(box), ST_Ymin(box), ST_Xmax(box), ST_Ymax(box), ST_Zmin(box), ST_Zmax(box) FROM (select st_transform(st_3dextent({geometry_column}),4979) AS box from {geometry_table} {q}) as total";

var cmd = new NpgsqlCommand(sql, conn);

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