{"id":234052,"date":"2019-05-16T14:15:22","date_gmt":"2019-05-16T21:15:22","guid":{"rendered":"https:\/\/www.esri.com\/about\/newsroom\/?post_type=arcuser&#038;p=234052"},"modified":"2024-10-01T15:47:14","modified_gmt":"2024-10-01T22:47:14","slug":"understanding-weighted-overlay","status":"publish","type":"arcuser","link":"https:\/\/www.esri.com\/about\/newsroom\/arcuser\/understanding-weighted-overlay","title":{"rendered":"Understanding Weighted Overlay"},"author":4922,"featured_media":0,"menu_order":0,"template":"","format":"standard","meta":{"_acf_changed":false,"sync_status":"","episode_type":"","audio_file":"","podmotor_file_id":"","podmotor_episode_id":"","castos_file_data":"","cover_image":"","cover_image_id":"","duration":"","filesize":"","filesize_raw":"","date_recorded":"","explicit":"","block":"","itunes_episode_number":"","itunes_title":"","itunes_season_number":"","itunes_episode_type":"","_links_to":"","_links_to_target":""},"categories":[],"tags":[],"arcuser_issues":[154592],"class_list":["post-234052","arcuser","type-arcuser","status-publish","format-standard","hentry","arcuser_issues-fall-2014"],"acf":{"short_description":"Weighted overlay is one method of modeling suitability. ArcGIS uses the following process for this analysis\u2026","pdf":{"host_remotely":true,"file":null,"file_url":""},"flexible_content":[{"acf_fc_layout":"content","content":"Weighted overlay is one method of modeling suitability. ArcGIS uses the following process for this analysis.\r\n\r\nEach raster layer is assigned a weight in the suitability analysis.\r\n\r\nValues in the rasters are reclassified to a common suitability scale.\r\n\r\nRaster layers are overlayed, multiplying each raster cell's suitability value by its layer weight and totaling the values to derive a suitability value.\r\n\r\nThese values are written to new cells in an output layer.\r\n\r\nThe symbology in the output layer is based on these values.\r\n\r\nAssigning a weight to each raster in the overlay process allows you to control the influence of different criteria in the suitability model. In the Spero model, you could weight slope more than aspect. Table\u00a01 shows the result of overlaying two raster cells, one slope, and one aspect. Multiplying each layer's weight by each cell's suitability value produces a weighted suitability value. Weighted suitability values are totaled for each overlaying cell and then written to an output layer.\r\n<table class=\"esriTable blueTable centerData\">\r\n<thead>\r\n<tr>\r\n<th>Layer<\/th>\r\n<th>Weight\r\n(as percent)<\/th>\r\n<th>Cell suitability value<\/th>\r\n<th>Weighted suitability value<\/th>\r\n<\/tr>\r\n<\/thead>\r\n<tbody>\r\n<tr>\r\n<td class=\"firstCol\">Slope<\/td>\r\n<td>80<\/td>\r\n<td>5<\/td>\r\n<td>4<\/td>\r\n<\/tr>\r\n<tr class=\"stripe\">\r\n<td class=\"firstCol\">Aspect<\/td>\r\n<td>20<\/td>\r\n<td>5<\/td>\r\n<td>1<\/td>\r\n<\/tr>\r\n<tr>\r\n<td class=\"firstCol\">Total suitability value<\/td>\r\n<td><\/td>\r\n<td><\/td>\r\n<td>5<\/td>\r\n<\/tr>\r\n<\/tbody>\r\n<\/table>\r\n<span class=\"caption\">Table 1: Totaling weighted suitability values<\/span>"},{"acf_fc_layout":"pdf","file":235262}],"references":null},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v25.9 (Yoast SEO v25.9) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Understanding Weighted Overlay | Fall 2014 | ArcUser<\/title>\n<meta name=\"description\" content=\"Weighted overlay is one method of modeling suitability. 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