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msTransformMapToSource(): extra fixes to handle lon_wrap=180 and sour…
…ce dataset whose longitude range is larger than 360 deg
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rouault committed Jan 3, 2020
1 parent 72c7845 commit 421a1fcecfa3bf5fa7ee944ea41b30eeaab734f6
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Showing 5 changed files with 70 additions and 7 deletions.
@@ -1145,6 +1145,7 @@ static int msTransformMapToSource( int nDstXSize, int nDstYSize,
double dfYMinOut = 0.0;
double dfXMaxOut = 0.0;
double dfYMaxOut = 0.0;
const double dfHalfRes = adfDstGeoTransform[1] / 2;

/* Find out average y coordinate in src projection */
for( i = 0; i < nSamples; i++ ) {
@@ -1183,7 +1184,7 @@ static int msTransformMapToSource( int nDstXSize, int nDstYSize,
2, 1, x2, y2, z2 );
msReleaseLock( TLOCK_PROJ );

if( x2[0] >= dfXMinOut && x2[0] <= dfXMaxOut &&
if( x2[0] >= dfXMinOut - dfHalfRes && x2[0] <= dfXMaxOut + dfHalfRes &&
y2[0] >= dfYMinOut && y2[0] <= dfYMaxOut )
{
double x_out = adfInvSrcGeoTransform[0]
@@ -1193,8 +1194,8 @@ static int msTransformMapToSource( int nDstXSize, int nDstYSize,
+ (dfLonWrap-180)*adfInvSrcGeoTransform[4]
+ dfY*adfInvSrcGeoTransform[5];

/* Does the raster cover a whole 360 deg range ? */
if( nSrcXSize == (int)(adfInvSrcGeoTransform[1] * 360 + 0.5) )
/* Does the raster cover, at least, a whole 360 deg range ? */
if( nSrcXSize >= (int)(adfInvSrcGeoTransform[1] * 360) )
{
psSrcExtent->minx = 0;
psSrcExtent->maxx = nSrcXSize;
@@ -1208,8 +1209,8 @@ static int msTransformMapToSource( int nDstXSize, int nDstYSize,
psSrcExtent->maxy = MS_MAX(psSrcExtent->maxy, y_out);
}

if( x2[1] >= dfXMinOut && x2[1] <= dfXMaxOut &&
x2[1] >= dfYMinOut && y2[1] <= dfYMaxOut )
if( x2[1] >= dfXMinOut - dfHalfRes && x2[1] <= dfXMaxOut + dfHalfRes &&
y2[1] >= dfYMinOut && y2[1] <= dfYMaxOut )
{
double x_out = adfInvSrcGeoTransform[0]
+ (dfLonWrap+180)*adfInvSrcGeoTransform[1]
@@ -1218,8 +1219,8 @@ static int msTransformMapToSource( int nDstXSize, int nDstYSize,
+ (dfLonWrap+180)*adfInvSrcGeoTransform[4]
+ dfY*adfInvSrcGeoTransform[5];

/* Does the raster cover a whole 360 deg range ? */
if( nSrcXSize == (int)(adfInvSrcGeoTransform[1] * 360 + 0.5) )
/* Does the raster cover, at least, a whole 360 deg range ? */
if( nSrcXSize >= (int)(adfInvSrcGeoTransform[1] * 360) )
{
psSrcExtent->minx = 0;
psSrcExtent->maxx = nSrcXSize;
@@ -0,0 +1,25 @@
ncols 41
nrows 20
xllcorner -4.5
yllcorner -90.000000000000
cellsize 9.000000000000
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@@ -0,0 +1 @@
GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]
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@@ -0,0 +1,36 @@
# Test behaviour with a projection with lon_wrap=180

MAP

NAME TEST
STATUS ON
SIZE 40 20
EXTENT -180 -89.9999 180 90
IMAGECOLOR 0 0 0

PROJECTION
"init=epsg:4326"
END

OUTPUTFORMAT
NAME "png"
DRIVER AGG/PNG
MIMETYPE "image/png"
IMAGEMODE RGBA
EXTENSION "png"
END

LAYER
NAME test
TYPE RASTER
STATUS default
DATA "data/lon_wrap_180_covering_more_than_360deg.asc"
PROJECTION
"proj=longlat"
"datum=WGS84"
"lon_wrap=180"
"no_defs"
END
END

END # of map file

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