jiayuasu commented on code in PR #3114:
URL: https://github.com/apache/sedona/pull/3114#discussion_r3668140607
##########
common/src/main/java/org/apache/sedona/common/raster/RasterConstructors.java:
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@@ -130,8 +131,35 @@ public static GridCoverage2D asRaster(
boolean useGeometryExtent)
throws FactoryException {
+ // Reject a burn value that cannot be represented in the target pixel
type, for the same reason
+ // the noDataValue is rejected below: silently coercing an out-of-range or
fractional value (for
+ // example 265 -> 9 in an unsigned 8-bit band) would store a different
number than the caller
+ // asked to burn. Unlike noDataValue this is a primitive double, so it is
always validated.
+ RasterUtils.assertRepresentable(value, pixelType, "value");
+
+ // Reject a noDataValue that cannot be represented in the target pixel
type rather than
+ // silently coercing it: writing an out-of-range or fractional value into
an integer sample
+ // stores a different number than the value recorded as the band's nodata
metadata, so the
+ // background would read back as data. Validating once here keeps the
background fill and the
+ // nodata metadata below using the same value.
+ if (noDataValue != null) {
+ noDataValue = RasterUtils.assertNoDataValueRepresentable(noDataValue,
pixelType);
+ }
+
+ // If the burn value equals the noDataValue, every covered pixel reads
back as nodata, so the
+ // geometry would vanish from the output. Reject rather than produce an
all-nodata raster; this
+ // also catches the default burn value of 1 colliding with an inherited
nodata of 1.0.
+ if (noDataValue != null && Double.compare(value, noDataValue) == 0) {
Review Comment:
ok fine by me
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