Hello all, I am trying to create a graph for network analysis using gdalgnm.The feature auto connect is working if we provide more than one layer.How can we connect features of a single layer so that graph is created automatically. We can connect features using connect features but automatically it is not conncting using auto connect .Here is the code.
char **options = NULL; options = CSLAddNameValue(options,GNM_INIT_OPTIONPAIR_NAME, "roads_network"); GNMGdalNetwork *poNet; poNet = GNMManager::GdalCreateNetwork("/home/shiva/Desktop/network/network_data", "ESRI Shapefile", "EPSG:4326", options); CSLDestroy(options); if (poNet == NULL) { printf("Failed to create network\n"); exit(1); } GDALDataset *poSrcDS = (GDALDataset*) GDALOpenEx("/home/shiva/Desktop/network/data", GDAL_OF_VECTOR | GDAL_OF_READONLY, NULL, NULL, NULL ); if(poSrcDS == NULL) { printf("Can not open source dataset at\n"); exit(1); } OGRLayer *poSrcLayer2 = poSrcDS->GetLayerByName("roads"); if (poSrcLayer2 == NULL) { printf("layer is null\n"); printf("Can not process layers of source dataset\n"); exit(1); } GNMErr err2 = poNet->CopyLayer(poSrcLayer2, "roads"); if (err2 != GNMERR_NONE) { printf("Can not import layers from source dataset\n"); exit(1); } GDALClose(poSrcDS); if (poNet->CreateRule("CLASS gnm_roads_line COSTS TIGER_ID") != GNMERR_NONE) { printf("Can not create rule\n"); } if (poNet->CreateRule("NETWORK CONNECTS gnm_roads_line WITH gnm_roads_line ") != GNMERR_NONE) { printf("Can not create rule\n"); } printf("\nBuilding network topology ...\n"); GDALDataset *poNetDS = poNet->GetDataset(); OGRLayer **layers = new OGRLayer*[3]; layers[0] = poNetDS->GetLayerByName("gnm_roads_line"); layers[2] = NULL; layers[1] = NULL; if (poNet->AutoConnect(layers,0.05, NULL) != GNMERR_NONE) { printf("Building topology failed\n"); exit(1); } else { printf("Topology has been built successfully\n"); } delete[] layers; GNMManager::GdalCloseNetwork(poNet); thanks, hema -- View this message in context: http://osgeo-org.1560.x6.nabble.com/creating-graph-for-single-line-shape-layer-using-gdal-gnm-tp5172326.html Sent from the GDAL - Dev mailing list archive at Nabble.com. _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev