Add test of thinning and ordering features

Makefile

@@ -287,6 +287,11 @@ overzoom-test: tippecanoe-overzoom
 	./tippecanoe-overzoom -o tests/pbf/14-2616-6331.pbf tests/pbf/11-327-791.pbf 11/327/791 14/2616/6331
 	cmp tests/pbf/14-2616-6331.pbf /dev/null
 	rm tests/pbf/14-2616-6331.pbf
+	# Thinning and ordering
+	./tippecanoe-overzoom -y NAME -O MAX_POP10 -m 30 -o tests/pbf/0-0-0-pop-filtered.pbf tests/pbf/0-0-0-pop.pbf 0/0/0 0/0/0
+	./tippecanoe-decode tests/pbf/0-0-0-pop-filtered.pbf 0 0 0 > tests/pbf/0-0-0-pop-filtered.pbf.json.check
+	cmp tests/pbf/0-0-0-pop-filtered.pbf.json.check tests/pbf/0-0-0-pop-filtered.pbf.json
+	rm tests/pbf/0-0-0-pop-filtered.pbf tests/pbf/0-0-0-pop-filtered.pbf.json.check
 
 join-test: tippecanoe tippecanoe-decode tile-join
 	./tippecanoe -q -f -z12 -o tests/join-population/tabblock_06001420.mbtiles -YALAND10:'Land area' -L'{"file": "tests/join-population/tabblock_06001420.json", "description": "population"}'

clip.cpp

@@ -811,7 +811,8 @@ struct sorter {
 			exit(EXIT_IMPOSSIBLE);
 		}
 
-		return av < bv;
+		// descending; we are keeping the largest value for now
+		return bv < av;
 	}
 };
 

overzoom.cpp

@@ -54,6 +54,7 @@ int main(int argc, char **argv) {
 			break;
 
 		default:
+			fprintf(stderr, "Unrecognized flag -%c\n", i);
 			usage(argv);
 		}
 	}

tests/pbf/0-0-0-pop-filtered.pbf.json

@@ -0,0 +1,21 @@
+{ "type": "FeatureCollection", "properties": { "zoom": 0, "x": 0, "y": 0 }, "features": [
+{ "type": "FeatureCollection", "properties": { "layer": "in", "version": 2, "extent": 4096 }, "features": [
+{ "type": "Feature", "properties": { "NAME": "Mexico City" }, "geometry": { "type": "Point", "coordinates": [ -99.140625, 19.476950 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "London" }, "geometry": { "type": "Point", "coordinates": [ -0.087891, 51.508742 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Sao Paulo" }, "geometry": { "type": "Point", "coordinates": [ -46.669922, -23.563987 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Moscow" }, "geometry": { "type": "Point", "coordinates": [ 37.617188, 55.776573 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Cairo" }, "geometry": { "type": "Point", "coordinates": [ 31.289062, 30.069094 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Dhaka" }, "geometry": { "type": "Point", "coordinates": [ 90.439453, 23.725012 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Shanghai" }, "geometry": { "type": "Point", "coordinates": [ 121.464844, 31.203405 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Jakarta" }, "geometry": { "type": "Point", "coordinates": [ 106.787109, -6.140555 ] } }
+,
+{ "type": "Feature", "properties": { "NAME": "Auckland" }, "geometry": { "type": "MultiPoint", "coordinates": [ [ 174.726562, -36.879621 ], [ -185.273438, -36.879621 ] ] } }
+] }
+] }