Make tests independent of proj-datumgrid

Fixes #1984

- Copy BETA2007.gsb, MD, alaska, conus, ntf_r93.gsb, ntv1_can.dat grids
  from proj-datumgrid to data/tests.
- Replace a couple uses of nzgd2kgrid0005.gsb in tests by ntf_r93.gsb
- Add downsampled/subsetted versions of egm96_15.gtx as tests/egm96_15_downsampled.gtx
  and ntv2_0.gsb as tests/ntv2_0_downsampled.gsb
  This results in a few changes in expected results
- Simpify travis/install.sh due to less configurations to test

This results in a hopefully acceptable increase of the proj-X.Y.Z.tar.gz
from 2.9 to 5.3 MB

10 files changed, 49 insertions, 24 deletions

diff --git a/data/CMakeLists.txt b/data/CMakeLists.txt
index 53848a67..fa2e35d5 100644
--- a/data/CMakeLists.txt
+++ b/data/CMakeLists.txt
@@ -70,30 +70,34 @@ set(DATA_FOR_TESTS
     GL27
     nad27
     nad83
-    ntv1_can.dat
-    MD
-    ntf_r93.gsb
-    egm96_15.gtx
-    ntv2_0.gsb
-    conus
-    alaska
-    nzgd2kgrid0005.gsb
-    ITRF2000
-    BETA2007.gsb)
-file(GLOB DATA_TESTS tests/*)
+    ITRF2000)
 
 execute_process(COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_BINARY_DIR}/for_tests)
 execute_process(COMMAND ${CMAKE_COMMAND} -E make_directory ${CMAKE_CURRENT_BINARY_DIR}/for_tests/tests)
+
 foreach(FILE ${DATA_FOR_TESTS} ${CONFIG_FILES})
-    if (EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/${FILE})
-        configure_file(${CMAKE_CURRENT_SOURCE_DIR}/${FILE} ${CMAKE_CURRENT_BINARY_DIR}/for_tests/${FILE} COPYONLY)
-    endif()
+    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/${FILE} ${CMAKE_CURRENT_BINARY_DIR}/for_tests/${FILE} COPYONLY)
 endforeach()
+
+file(GLOB DATA_TESTS tests/*)
 foreach(FILE ${DATA_TESTS})
     get_filename_component(FILENAME ${FILE} NAME)
     configure_file(${FILE} ${CMAKE_CURRENT_BINARY_DIR}/for_tests/tests/${FILENAME} COPYONLY)
 endforeach()
 
+set(DATA_FOR_TESTS_FROM_TESTS_SUBDIR
+    alaska
+    BETA2007.gsb
+    conus
+    MD
+    ntf_r93.gsb
+    ntv1_can.dat)
+foreach(FILE ${DATA_FOR_TESTS_FROM_TESTS_SUBDIR})
+    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/tests/${FILE} ${CMAKE_CURRENT_BINARY_DIR}/for_tests/${FILE} COPYONLY)
+endforeach()
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/tests/egm96_15_downsampled.gtx ${CMAKE_CURRENT_BINARY_DIR}/for_tests/egm96_15.gtx COPYONLY)
+configure_file(${CMAKE_CURRENT_SOURCE_DIR}/tests/ntv2_0_downsampled.gsb ${CMAKE_CURRENT_BINARY_DIR}/for_tests/ntv2_0.gsb COPYONLY)
+
 #
 #install
 #
diff --git a/data/Makefile.am b/data/Makefile.am
index e284c6e0..8dbfed1b 100644
--- a/data/Makefile.am
+++ b/data/Makefile.am
@@ -89,6 +89,14 @@ EXTRA_DIST = proj.ini GL27 nad.lst nad27 nad83 \
 		tests/us_noaa_geoid06_ak_subset_at_antimeridian.tif \
 		tests/test_hgrid_little_endian.gsb \
 		tests/test_hgrid_big_endian.gsb \
+		tests/BETA2007.gsb \
+		tests/MD \
+		tests/alaska \
+		tests/conus \
+		tests/egm96_15_downsampled.gtx \
+		tests/ntv1_can.dat \
+		tests/ntv2_0_downsampled.gsb \
+		tests/ntf_r93.gsb \
 		generate_all_sql_in.cmake sql_filelist.cmake \
 		$(SQL_ORDERED_LIST)
 
@@ -143,6 +151,19 @@ proj.db: $(DATAPATH)/sql/*.sql
 # For out-of-tree builds, link all file of the source data dir to the generated data
 # Also link select resource files in a for_tests subdirectory so that we are not
 # influenced by the presence of other grids
+
+# egm96_15_downsampled.gtx created with
+# gdal_translate proj-datumgrid/egm96_15.gtx egm96_15_downsampled.gtx -of GTX -outsize 25% 25% -r average
+
+# ntv2_0_downsampled.gsb created with:
+# gdal_translate NTv2:0:/home/even/proj/proj-datumgrid/north-america/ntv2_0.gsb  /tmp/ntv2_0_downsampled.gsb -of NTv2 -outsize 10% 10%
+# gdal_translate NTv2:1:/home/even/proj/proj-datumgrid/north-america/ntv2_0.gsb  /tmp/ntv2_0_downsampled.gsb -of NTv2 -outsize 10% 10% -co append_subdataset=yes
+# gdal_translate NTv2:2:/home/even/proj/proj-datumgrid/north-america/ntv2_0.gsb  /tmp/ntv2_0_downsampled.gsb -of NTv2 -outsize 10% 10% -co append_subdataset=yes
+# gdal_translate NTv2:3:/home/even/proj/proj-datumgrid/north-america/ntv2_0.gsb  /tmp/ntv2_0_downsampled.gsb -of NTv2 -outsize 10% 10% -co append_subdataset=yes
+# gdal_translate NTv2:99:/home/even/proj/proj-datumgrid/north-america/ntv2_0.gsb  /tmp/ntv2_0_downsampled.gsb -of NTv2 -co append_subdataset=yes
+# gdal_translate NTv2:44:/home/even/proj/proj-datumgrid/north-america/ntv2_0.gsb  /tmp/ntv2_0_downsampled.gsb -of NTv2 -co append_subdataset=yes
+# gdal_translate NTv2:4:/home/even/proj/proj-datumgrid/north-america/ntv2_0.gsb  /tmp/ntv2_0_downsampled.gsb -of NTv2 -co append_subdataset=yes
+
 check-local:
 	@if [ ! -f GL27 ]; then \
 		for x in $(DATAPATH)/*; do \
@@ -154,24 +175,24 @@ check-local:
 	for x in $(DATAPATH)/GL27 \
 		 $(DATAPATH)/nad27 \
 		 $(DATAPATH)/nad83 \
-		 $(DATAPATH)/ntv1_can.dat \
-		 $(DATAPATH)/MD \
-		 $(DATAPATH)/ntf_r93.gsb \
-		 $(DATAPATH)/egm96_15.gtx \
-		 $(DATAPATH)/ntv2_0.gsb \
-		 $(DATAPATH)/conus \
-		 $(DATAPATH)/alaska \
-		 $(DATAPATH)/nzgd2kgrid0005.gsb \
+		 $(DATAPATH)/tests/ntv1_can.dat \
+		 $(DATAPATH)/tests/MD \
+		 $(DATAPATH)/tests/ntf_r93.gsb \
+		 $(DATAPATH)/tests/conus \
+		 $(DATAPATH)/tests/alaska \
 		 $(DATAPATH)/ITRF2000 \
-		 $(DATAPATH)/BETA2007.gsb; \
+		 $(DATAPATH)/tests/BETA2007.gsb; \
 	do \
 		if test -f "$$x" ; then \
 			ln -sf "../$$x" for_tests; \
 		else \
-			echo "WARNING: grid $$x missing: some tests will be skipped"; \
+			echo "ERROR: grid $$x missing: some tests will be skipped"; \
+			exit 1; \
 		fi \
 	done; \
 	ln -sf ../$(DATAPATH)/tests for_tests; \
+	ln -sf ../$(DATAPATH)/tests/ntv2_0_downsampled.gsb for_tests/ntv2_0.gsb; \
+	ln -sf ../$(DATAPATH)/tests/egm96_15_downsampled.gtx for_tests/egm96_15.gtx; \
 	ln -sf ../$(DATAPATH)/proj.ini for_tests; \
 	ln -sf ../proj.db for_tests
 
diff --git a/data/tests/BETA2007.gsb b/data/tests/BETA2007.gsb
new file mode 100644
index 00000000..69cd3346
--- /dev/null
+++ b/data/tests/BETA2007.gsb
diff --git a/data/tests/MD b/data/tests/MD
new file mode 100644
index 00000000..c8500e97
--- /dev/null
+++ b/data/tests/MD
diff --git a/data/tests/alaska b/data/tests/alaska
new file mode 100644
index 00000000..bb6be2ff
--- /dev/null
+++ b/data/tests/alaska
diff --git a/data/tests/conus b/data/tests/conus
new file mode 100644
index 00000000..44b4900f
--- /dev/null
+++ b/data/tests/conus
diff --git a/data/tests/egm96_15_downsampled.gtx b/data/tests/egm96_15_downsampled.gtx
new file mode 100644
index 00000000..ea53ab10
--- /dev/null
+++ b/data/tests/egm96_15_downsampled.gtx
diff --git a/data/tests/ntf_r93.gsb b/data/tests/ntf_r93.gsb
new file mode 100644
index 00000000..07e34fcb
--- /dev/null
+++ b/data/tests/ntf_r93.gsb
diff --git a/data/tests/ntv1_can.dat b/data/tests/ntv1_can.dat
new file mode 100644
index 00000000..8acad077
--- /dev/null
+++ b/data/tests/ntv1_can.dat
diff --git a/data/tests/ntv2_0_downsampled.gsb b/data/tests/ntv2_0_downsampled.gsb
new file mode 100644
index 00000000..06b81110
--- /dev/null
+++ b/data/tests/ntv2_0_downsampled.gsb