[Gdal-dev] Help on writing a new OGR driver

[Frédéric Trastour]

Hello,

I need to add support for a new format to OGR.

This new driver must have read access and at least sequential write.

The format itself is quite simple :

a "List" file describes the available layers :

------------------------------------------------------------------------------------------------------------------------
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RAYTRACE     Buildings0_0.vec    417285 4921000      428400 4932380      Buildings
RAYTRACE     Vegetation0_0.vec   417340 4921000      428400 4932403      Vegetation
GENAMAP19    Water0_1.vec         428400 4921000      438532 4931908      Water
GENAMAP19    Roads1_1.vec     428400 4909035      439343 4921000      Roads
GENAMAP19    Roads0_1.vec     428400 4921000      440200 4932633      Roads
GENAMAP19    Roads1_0.vec     417229 4909254      428400 4921000      Roads
GENAMAP19    Roads0_0.vec     417322 4921000      428400 4932634      Roads
------------------------------------------------------------------------------------------------------------------------
-----

Each layer may be tiled ( like roads in this example ).

geometries are stored in simple ASCII files (.vec). :

------------------------------------------------------------------------------------------------------------------------
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1              Buildings                          11
429054.57 4928806.60
429057.58 4928804.19
429060.59 4928807.20
429066.01 4928802.39
429058.19 4928792.76
429056.38 4928793.36
429052.08 4928788.79
429046.80 4928792.04
429051.57 4928798.18
429049.16 4928799.98
429054.57 4928806.60
2              Buildings                          5
429095.14 4928805.45
429098.79 4928802.60
429095.95 4928797.32
429091.48 4928800.57
429095.14 4928805.45
3              Buildings                          7
429109.36 4928795.70
429123.57 4928787.57
429116.67 4928779.85
------------------------------------------------------------------------------------------------------------------------
-----

I think to choose "List" as the file representing the OGRDataSource, each Layer will appears as an OGRLayer
( automatically untiled if necessary ).

Is there any tutorial on writing new driver for OGR ?
What is the best existing driver to select as a template for this case ?

Thanks for any hints or comments and excuse me for my poor english...

Frédéric.
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Frédéric Trastour - SpacEyes - dev at spaceyes.fr