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grdcontour: Check that grd has at least 2 rows/columns before trying to contour it. #9062

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Merged
joa-quim merged 1 commit into from
Jun 6, 2026
+5 −1
Merged

grdcontour: Check that grd has at least 2 rows/columns before trying to contour it. #9062

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6 changes: 5 additions & 1 deletion src/grdcontour.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1119,9 +1119,13 @@ EXTERN_MSC int GMT_grdcontour (void *V_API, int mode, void *args) {

/* Read data */

if (GMT_Read_Data (API, GMT_IS_GRID, GMT_IS_FILE, GMT_IS_SURFACE, GMT_DATA_ONLY, wesn, Ctrl->In.file, G) == NULL) {
if (GMT_Read_Data(API, GMT_IS_GRID, GMT_IS_FILE, GMT_IS_SURFACE, GMT_DATA_ONLY, wesn, Ctrl->In.file, G) == NULL) {
Return (API->error);
}
if (G->header->n_rows == 1 || G->header->n_columns == 1) {
GMT_Report(API, GMT_MSG_WARNING, "Contouring grid has only 1 row or 1 column. Cannot do contours for such cases.\n");
Return(API->error);
}

if (gmt_M_type (GMT, GMT_IN, GMT_Z) == GMT_IS_ABSTIME) { /* Grid data is time */
/* To properly label contours using GMT time formatting we will rely on the machinery
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