Parse ESRI/ArcInfo (ArcGrid) raster GIS files.
A parser for ESRI/ArcInfo (ArcGrid) files. These are raster GIS files widely used by many geographics-related software to represent elevations or terrain features.
Description
This is a parser for ESRI/ArcInfo (ArcGrid) files. These are raster GIS files widely used by many geographics-related software to represent elevations or terrain features.
Only ASCII GRID (.asc) files are supported at the moment.
In app/valley.asc there is a test elevation model of a small valley area. It is parsed and printed by the arcgrid-exe if you do stack exec arcgrid-exe.
Usage
The library exports the ArcGrid datatype and its accessors:
data ArcGrid = ArcGrid
{ ncols :: Int
, nrows :: Int
, xllcorner :: Maybe Float
, yllcorner :: Maybe Float
, xllcenter :: Maybe Float
, yllcenter :: Maybe Float
, cellsize :: Float
, nodata_value :: Maybe Int
, vat :: [Int]
}
The main interface for reading of grid files is arcGridFromFile, but the bytestring parser (to be used with Parsec) is also exported.
arcGridFromFile :: String -> IO ArcGrid
asciiGridParser :: Parser ArcGrid
TODO:
- unparsing
- optimizations
- support of proprietary binary formats?