Loading GIS data

[Leguark]

• cpg -> https://github.com/GeospatialPython/pyshp
• dbf -> https://dbfread.readthedocs.io/en/latest/
• prj -> ?
• qpj
• shp -> https://github.com/GeospatialPython/pyshp
• shx
• ers https://gdal.org/drivers/raster/ers.html

[Leguark]

@AlexanderJuestel of these formats which ones are you already able to read in gemgis?

[AlexanderJuestel]

Hey,

• cpg, dbf, prj, shx und shp are vector files and belong together. What we read with geopandas is the shape file (shp) with all associated files.

shp - shape format - the feature geometry itself
shx - shape index format - a positional index of the feature to allow seeking forwards and backwards quickly
dbf - attribute format - columnar attributes for each shape
cpg - used to specify the code page
prj - projection description

Here how one set of files look like

• ers - have not tested them yet as I did not have sample data in that format. But as rasterio is based on GDAL, it should be able to read it.

[Leguark]

So technically we "only" need geopandas for this formats? For subsurface I am trying to keep all those libraries optional (i.e. you only need to install them if you want to load that specific type of data).

@AlexanderJuestel if I prepare you the module and test do you want to give a go to this issue?

[AlexanderJuestel]

Sorry for the late reply.

Geopandas should be sufficient. Lately, I have worked much more with shapely though. Each GeoSeries in a GeoDataFrame consists of a shapely object and you can do all sorts of operations on these objects. The data is usually opened with Fiona. So what I usually do now is to build a GeoDataFrame as last step of each working process to have a better visualization for the user :)