Merge pull request #115 from meomancer/development

clipping with native resolution

django_project/clip-and-ship/views.py

@@ -6,6 +6,7 @@
 import urllib2
 
 import subprocess
+from pyproj import Proj, transform
 from django.conf import settings
 from django.http import Http404, HttpResponse, JsonResponse
 from django.shortcuts import render
@@ -18,6 +19,11 @@
           'format=geotiff&crs=EPSG:4326&bbox={bbox}&width={width}&' \
           'height={height}'
 
+WCS_URL_2_0_1 = settings.GEOSERVER_BASE_URL + \
+                'wcs?request=getcoverage&' \
+                'version=2.0.1&service=WCS&coverageid={layer_name}&' \
+                'format=geotiff&crs=EPSG:4326&subset=E({x1},{x2})&subset=N({y1},{y2})'
+
 MAX_CLIP_SIZE = settings.MAXIMUM_CLIP_SIZE
 TILE_SAMPLE_SIZE = 100  # tile sample size will be 100*100
 
@@ -69,6 +75,28 @@ def download_wcs(layername, bbox_string, width, height, raster_filepath):
     fh.close()
 
 
+def download_wcs_v2(layername, x1, x2, y1, y2, raster_filepath):
+    """ Download clipped image from wcs.
+
+    :param raster_filepath: filepath for downloaded wcs clipped
+    :type raster_filepath: str
+
+    :return:
+    """
+    wcs_formatted_url = WCS_URL_2_0_1.format(
+        layer_name=layername,
+        x1=x1,
+        x2=x2,
+        y1=y1,
+        y2=y2
+    )
+
+    response = urllib2.urlopen(wcs_formatted_url)
+    fh = open(raster_filepath, "w")
+    fh.write(response.read())
+    fh.close()
+
+
 def clip_layer(request, layername):
     """Clipping raster layer and save to temp folder.
     Clipping layer by bbox or by geojson.
@@ -186,8 +214,15 @@ def clip_layer(request, layername):
         raster_filepath = os.path.join(
             temporary_folder,
             layer.title + '.' + extention)
+        x1, x2 = bbox_array[0], bbox_array[2]
+        y1, y2 = bbox_array[1], bbox_array[3]
+        inProj = Proj(init='epsg:4326')
+        outProj = Proj(init='epsg:32618')
+
+        x1, y1 = transform(inProj, outProj, x1, y1)
+        x2, y2 = transform(inProj, outProj, x2, y2)
 
-        download_wcs(layername, bbox_string, width, height, raster_filepath)
+        download_wcs_v2(layername, x1, x2, y1, y2, raster_filepath)
 
         if not geojson:
             response = JsonResponse({