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tutorial_raster.jl
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tutorial_raster.jl
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# Tests based on the Raster API tutorial found at http://gdal.org/gdal_tutorial.html
using GDAL
utmsmall = joinpath(@__DIR__, "data/utmsmall.tif")
utmsmall_copy = joinpath(@__DIR__, "tmp/utmsmall.tif")
# Opening the File
dataset = GDAL.gdalopen(utmsmall, GDAL.GA_ReadOnly) # file from GDAL SVN
# Getting Dataset Information
driver = GDAL.gdalgetdriverbyname("GTiff")
@test GDAL.gdalgetdrivershortname(driver) == "GTiff"
@test GDAL.gdalgetdriverlongname(driver) == "GeoTIFF"
@test GDAL.gdalgetrasterxsize(dataset) == 100
@test GDAL.gdalgetrasterysize(dataset) == 100
@test GDAL.gdalgetrastercount(dataset) == 1
nad27_prefix = "PROJCS[\"NAD27 / UTM zone 11N\",GEOGCS[\"NAD27\",DATUM[\"North_American_Datum_1927\","
@test startswith(GDAL.gdalgetprojectionref(dataset), nad27_prefix)
geotransform = fill(0.0, 6)
GDAL.gdalgetgeotransform(dataset, geotransform)
@test geotransform == [440720.0, 60.0, 0.0, 3.75132e6, 0.0, -60.0]
# Fetching a Raster Band
band = GDAL.gdalgetrasterband(dataset, 1)
blockxsize, blockysize = Ref(Cint(-1)), Ref(Cint(-1))
GDAL.gdalgetblocksize(band, blockxsize, blockysize)
@test blockxsize[] == 100
@test blockysize[] == 81
@test GDAL.gdalgetdatatypename(GDAL.gdalgetrasterdatatype(band)) == "Byte"
@test GDAL.gdalgetcolorinterpretationname(GDAL.gdalgetrastercolorinterpretation(band)) ==
"Gray"
gotmin, gotmax = Ref(Cint(-1)), Ref(Cint(-1))
@test GDAL.gdalgetrasterminimum(band, gotmin) == 0.0
@test GDAL.gdalgetrastermaximum(band, gotmax) == 255.0
@test gotmin[] == gotmax[] == 0
@test GDAL.gdalgetoverviewcount(band) == 0
# note that if there is no raster color table, no error (C_None) is set by GDAL
# so there is no GDALError thrown here
@test GDAL.gdalgetrastercolortable(band) == C_NULL
# Reading Raster Data
xsize = GDAL.gdalgetrasterbandxsize(band)
@test xsize == 100
scanline = fill(0.0f0, xsize)
GDAL.gdalrasterio(
band,
GDAL.GF_Read,
0,
0,
xsize,
1,
scanline,
xsize,
1,
GDAL.GDT_Float32,
0,
0,
)
@test scanline == Float32[
107.0f0,
123.0f0,
132.0f0,
115.0f0,
132.0f0,
132.0f0,
140.0f0,
132.0f0,
132.0f0,
132.0f0,
107.0f0,
132.0f0,
107.0f0,
132.0f0,
132.0f0,
107.0f0,
123.0f0,
115.0f0,
156.0f0,
148.0f0,
107.0f0,
132.0f0,
107.0f0,
115.0f0,
99.0f0,
123.0f0,
99.0f0,
74.0f0,
115.0f0,
82.0f0,
115.0f0,
115.0f0,
107.0f0,
123.0f0,
123.0f0,
99.0f0,
123.0f0,
123.0f0,
115.0f0,
115.0f0,
107.0f0,
90.0f0,
99.0f0,
107.0f0,
107.0f0,
99.0f0,
123.0f0,
107.0f0,
140.0f0,
123.0f0,
123.0f0,
115.0f0,
99.0f0,
132.0f0,
123.0f0,
115.0f0,
115.0f0,
123.0f0,
132.0f0,
115.0f0,
123.0f0,
132.0f0,
214.0f0,
156.0f0,
165.0f0,
148.0f0,
115.0f0,
148.0f0,
156.0f0,
148.0f0,
140.0f0,
165.0f0,
156.0f0,
197.0f0,
156.0f0,
197.0f0,
140.0f0,
173.0f0,
156.0f0,
165.0f0,
148.0f0,
156.0f0,
206.0f0,
214.0f0,
181.0f0,
206.0f0,
173.0f0,
222.0f0,
206.0f0,
255.0f0,
214.0f0,
173.0f0,
214.0f0,
255.0f0,
214.0f0,
247.0f0,
255.0f0,
230.0f0,
206.0f0,
197.0f0,
]
# Closing the Dataset
GDAL.gdalclose(dataset)
# Techniques for Creating Files
@test GDAL.gdalgetmetadataitem(driver, "DCAP_CREATE", "") == "YES"
@test GDAL.gdalgetmetadataitem(driver, "DCAP_CREATECOPY", "") == "YES"
# Using CreateCopy()
ds_src = GDAL.gdalopen(utmsmall, GDAL.GA_ReadOnly)
progressfunc = convert(Ptr{GDAL.GDALProgressFunc}, C_NULL)
ds_dst = GDAL.gdalcreatecopy(driver, utmsmall_copy, ds_src, 0, C_NULL, progressfunc, C_NULL)
GDAL.gdalclose(ds_dst)
GDAL.gdalclose(ds_src)
rm(utmsmall_copy)
# rest of the tutorial is skipped, perhaps we should wrap "cpl_string.h"
# to be able to build papszOptions, or write it in julia
# #include "cpl_string.h"
# ...
# char **papszOptions = NULL;
#
# papszOptions = CSLSetNameValue( papszOptions, "TILED", "YES" );
# papszOptions = CSLSetNameValue( papszOptions, "COMPRESS", "PACKBITS" );
# hDstDS = GDALCreateCopy( hDriver, pszDstFilename, hSrcDS, FALSE,
# papszOptions, GDALTermProgres, NULL );
# /* Once we're done, close properly the dataset */
# if( hDstDS != NULL )
# GDALClose( hDstDS );
# CSLDestroy( papszOptions );