Source Code for Module madrona.raster_stats.views

 1  # Create your views here. 
 2  from django.http import HttpResponse 
 3  from madrona.raster_stats.models import zonal_stats, RasterDataset, ZonalStatsCache 
 4  from django.core import serializers 
 5  from django.contrib.gis.geos import fromstr 
 6   
 7 -def stats_for_geom(request, raster_name): 
 8      # Confirm that we have a valid polygon geometry 
 9      if 'geom_txt' in request.REQUEST:  
10          geom_txt = str(request.REQUEST['geom_txt']) 
11      else: 
12          return HttpResponse("Must supply a geom_txt parameter", status=404) 
13   
14      try: 
15          geom = fromstr(geom_txt) 
16      except: 
17          return HttpResponse("Must supply a parsable geom_txt parameter (wkt or json)", status=404) 
18   
19      # Confirm raster with pk exists 
20      try: 
21          raster = RasterDataset.objects.get(name=raster_name) 
22      except: 
23          return HttpResponse("No raster with pk of %s" % pk, status=404) 
24   
25      #TODO check if continuous 
26      zonal = zonal_stats(geom, raster) 
27      zonal.save() 
28      zqs = ZonalStatsCache.objects.filter(pk=zonal.pk) 
29      data = serializers.serialize("json", zqs, fields=('avg','min','max','median','mode','stdev','nulls','pixels','date_modified','raster')) 
30      return HttpResponse(data, mimetype='application/json') 
31   
32 -def raster_list(request): 
33      rasts = RasterDataset.objects.all() 
34      data = serializers.serialize("json", rasts, fields=('name','type')) 
35      return HttpResponse(data, mimetype='application/json') 
36