Latest Contributions by JamesCrandall

I'd like to know how much the simplify task of the geometry service "alters" the input geometry? We have a public-facing Web AppBuilder application with a custom widget that allows users to upload a shapefile with polygon features of large areas that may be complex (think about a municipality with neighborhoods delineated).  These boundaries get added to a graphics layer when uploaded as a .shp and ultimately offers the user a save button that performs applyEdits on a FeatureService with the features in this graphics layer.  It's actually pretty straight forward and works well. Problem: cases where users have uploaded shapefiles containing self-intersecting polygon features, which causes the applyEdits to fail. We could just automatically perform a simplify on the features prior to performing applyEdits.  This allows the geometry to be saved but we're unsure how much the simplify has altered the input features and no way to inform the user "how much" it has changed or a way to quantify that the changes in geometry are acceptable. I suppose we could just inform the user about this, allow them to exit or continue but we still need a way to get their boundaries into our system.  In these cases we'd just have to do perform the update manually in ArcGIS Desktop. Comments appreciated! ... View more

I'm querying a map service and using the polygon ring coordinates to the use as input geometry for another map service query. It looks like I'm not able to guarantee the point order of the first result and treats this as an outside ring (applying incorrect selections on the second query). For example, I may have this as the initial ring: { "rings": [ [ [ -80.0929469116589, 26.6756462518988 ], [ -80.0924963005446, 26.6756390617361 ], [ -80.0924828894995, 26.6753730253964 ], [ -80.092965687122, 26.675375422123 ], [ -80.0929469116589, 26.6756462518988 ] ] ] }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ However, this selects features "outside" of that ring and it needs it to be in this order: { "rings": [ [ [ -80.0929469116589, 26.6756462518988 ], [ -80.092965687122, 26.675375422123 ], [ -80.0924828894995, 26.6753730253964 ], [ -80.0924963005446, 26.6756390617361 ], [ -80.0929469116589, 26.6756462518988 ] ] ] }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ Here's the basic code I am using to get the ring feature: ringFeat = '' qFl = 'https://services1.arcgis.com/sDAPyc2rGRn7vf9B/ArcGIS/rest/services/polySelectionLayer/FeatureServer/0/query' sql = "OBJECTID=2" qFlParams = urllib.urlencode({'f': 'json', 'geometryType': 'esriGeometryPolygon', 'geometry': '', 'spatialRel': 'esriSpatialRelIntersects', 'outSR': '4326', 'outFields': 'OBJECTID', 'returnGeometry': 'true', 'where': sql, 'token': token }) reqFl = urllib2.Request(qFl, qFlParams) errchk1 = '' try: response = urllib2.urlopen(reqFl) except urllib2.HTTPError, e: errchk1 = str(e.code) except urllib2.URLError, e: errchk1 = str(e.code) if errchk1 == '': jsonResult = json.load(response) appCount = len(jsonResult['features']) #if you have features, set the ringFeat to use in another query if appCount > 0: for feature in jsonResult['features']: ringFeat = feature['geometry'] #finalringFeat = json.loads(ringFeats) print json.dumps(ringFeat) finalRing = json.dumps(ringFeat)‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍ ... View more