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Adding minimal doc for #67

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Remi-C 2015-04-13 18:24:29 +02:00
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@ -466,6 +466,18 @@ The `pointcloud_postgis` extension adds functions that allow you to use PostgreS
>
> POINT Z (-127 45 124)
**PC_Compress(p pcpatch, compression_type text, compression_details text)** returns **pcpatch**
PC_Compress(mypatch, 'dimensional','zlib,sigbits,auto,rle');
> Returns a PcPatch compressed following the arguments
> compression_type : can be 'auto', 'ght', or 'dimensionnal'
> compression_details : can be comma separated list of 'auto', 'zlib', 'sigbits', 'rle'
> 'auto' lets the classical heuristic chose the compression
> warning : this function is only necessary for test purpose.
## Compressions ##
One of the issues with LIDAR data is that there is a lot of it. To deal with data volumes, PostgreSQL Pointcloud allows schemas to declare their preferred compression method in the `<pc:metadata>` block of the schema document. In the example schema, we declared our compression as follows: