diff --git a/Contributors.md b/Contributors.md
deleted file mode 100644
index fc97e277..00000000
--- a/Contributors.md
+++ /dev/null
@@ -1 +0,0 @@
-Rumen Mitrev
diff --git a/app/api/tiler.py b/app/api/tiler.py
index 128d0485..10ff77a0 100644
--- a/app/api/tiler.py
+++ b/app/api/tiler.py
@@ -54,7 +54,11 @@ def get_raster_path(task, tile_type):
 
 def rescale_tile(tile, mask, rescale = None):
     if rescale:
-        rescale_arr = list(map(float, rescale.split(",")))
+        try:
+            rescale_arr = list(map(float, rescale.split(",")))
+        except ValueError:
+            raise exceptions.ValidationError("Invalid rescale value")
+
         rescale_arr = list(_chunks(rescale_arr, 2))
         if len(rescale_arr) != tile.shape[0]:
             rescale_arr = ((rescale_arr[0]),) * tile.shape[0]
@@ -273,6 +277,12 @@ class Tiles(TaskNestedView):
         if tile_type in ['dsm', 'dtm'] and color_map is None:
             color_map = "gray"
 
+        if tile_type == 'orthophoto' and formula is not None:
+            if color_map is None:
+                color_map = "gray"
+            if rescale is None:
+                rescale = "-1,1"
+
         if nodata is not None:
             nodata = np.nan if nodata == "nan" else float(nodata)
         tilesize = scale * 256
@@ -310,8 +320,9 @@ class Tiles(TaskNestedView):
                 hillshade = float(hillshade)
                 if hillshade <= 0:
                     hillshade = 1.0
+                print(hillshade)
             except ValueError:
-                hillshade = 1.0
+                raise exceptions.ValidationError("Invalid hillshade value")
 
             if tile.shape[0] != 1:
                 raise exceptions.ValidationError("Cannot compute hillshade of non-elevation raster (multiple bands found)")
diff --git a/app/fixtures/tiny_drone_image_multispec.tif b/app/fixtures/tiny_drone_image_multispec.tif
new file mode 100644
index 00000000..a986ab20
Binary files /dev/null and b/app/fixtures/tiny_drone_image_multispec.tif differ
diff --git a/app/static/app/js/classes/Utils.js b/app/static/app/js/classes/Utils.js
index 072090eb..b252f88a 100644
--- a/app/static/app/js/classes/Utils.js
+++ b/app/static/app/js/classes/Utils.js
@@ -81,18 +81,6 @@ export default {
         }
     },
 
-    // https://stackoverflow.com/questions/11688692/how-to-create-a-list-of-unique-items-in-javascript
-    unique: function(arr){
-        let u = {}, a = [];
-        for(let i = 0, l = arr.length; i < l; ++i){
-            if(!u.hasOwnProperty(arr[i])) {
-                a.push(arr[i]);
-                u[arr[i]] = 1;
-            }
-        }
-        return a;
-    },
-
     getCurrentScriptDir: function(){
       let scripts= document.getElementsByTagName('script');
       let path= scripts[scripts.length-1].src.split('?')[0];      // remove any ?query
diff --git a/app/static/app/js/components/tests/LayersControl.test.jsx b/app/static/app/js/components/tests/LayersControl.test.jsx
new file mode 100644
index 00000000..b72fc3d9
--- /dev/null
+++ b/app/static/app/js/components/tests/LayersControl.test.jsx
@@ -0,0 +1,7 @@
+import LayersControl from '../LayersControl';
+
+describe('<LayersControlButton />', () => {
+  it('compiled without exploding', () => {
+    expect(LayersControl.prototype.onAdd !== undefined).toBe(true);
+  })
+});
\ No newline at end of file
diff --git a/app/static/app/js/components/tests/LayersControlLayer.test.jsx b/app/static/app/js/components/tests/LayersControlLayer.test.jsx
new file mode 100644
index 00000000..2c65cc18
--- /dev/null
+++ b/app/static/app/js/components/tests/LayersControlLayer.test.jsx
@@ -0,0 +1,13 @@
+import React from 'react';
+import { mount } from 'enzyme';
+import LayersControlLayer from '../LayersControlLayer';
+
+describe('<LayersControlLayer />', () => {
+    it('renders without exploding', () => {
+      const map = {
+          hasLayer: () => true
+      };
+      const wrapper = mount(<LayersControlLayer layer={{}} map={map} />);
+      expect(wrapper.exists()).toBe(true);
+    })
+});
\ No newline at end of file
diff --git a/app/static/app/js/css/ModelView.scss b/app/static/app/js/css/ModelView.scss
index fb99802b..15f1c163 100644
--- a/app/static/app/js/css/ModelView.scss
+++ b/app/static/app/js/css/ModelView.scss
@@ -73,7 +73,7 @@
         }
         .asset-download-buttons{
             .dropdown-menu{
-                left: -100%;
+                left: -150px;
             }
         }
 
diff --git a/app/tests/test_api_task.py b/app/tests/test_api_task.py
index 05e8798c..5d9269e5 100644
--- a/app/tests/test_api_task.py
+++ b/app/tests/test_api_task.py
@@ -17,7 +17,8 @@ import worker
 from django.utils import timezone
 
 from app import pending_actions
-from app.api.formulas import algos
+from app.api.formulas import algos, get_camera_filters_for
+from app.cogeo import valid_cogeo
 from app.models import Project, Task, ImageUpload
 from app.models.task import task_directory_path, full_task_directory_path, TaskInterruptedException
 from app.plugins.signals import task_completed, task_removed, task_removing
@@ -71,6 +72,8 @@ class TestApiTask(BootTransactionTestCase):
             # task creation via file upload
             image1 = open("app/fixtures/tiny_drone_image.jpg", 'rb')
             image2 = open("app/fixtures/tiny_drone_image_2.jpg", 'rb')
+            multispec_image = open("app/fixtures/tiny_drone_image_multispec.tif", 'rb')
+
 
             img1 = Image.open("app/fixtures/tiny_drone_image.jpg")
 
@@ -135,7 +138,7 @@ class TestApiTask(BootTransactionTestCase):
             testWatch.clear()
             gcp = open("app/fixtures/gcp.txt", 'r')
             res = client.post("/api/projects/{}/tasks/".format(project.id), {
-                'images': [image1, image2, gcp],
+                'images': [image1, image2, multispec_image, gcp],
                 'name': 'test_task',
                 'processing_node': pnode.id,
                 'resize_to': img1.size[0] / 2.0
@@ -145,11 +148,16 @@ class TestApiTask(BootTransactionTestCase):
             image1.seek(0)
             image2.seek(0)
             gcp.seek(0)
+            multispec_image.seek(0)
 
             # Uploaded images should have been resized
             with Image.open(resized_task.task_path("tiny_drone_image.jpg")) as im:
                 self.assertTrue(im.size[0] == img1.size[0] / 2.0)
 
+            # Except the multispectral image
+            with Image.open(resized_task.task_path("tiny_drone_image_multispec.tif")) as im:
+                self.assertTrue(im.size[0] == img1.size[0])
+
             # GCP should have been scaled
             with open(resized_task.task_path("gcp.txt")) as f:
                 lines = list(map(lambda l: l.strip(), f.readlines()))
@@ -337,6 +345,11 @@ class TestApiTask(BootTransactionTestCase):
             self.assertTrue(res.status_code == status.HTTP_200_OK)
             self.assertTrue(res.has_header('_stream'))
 
+            # The tif files are valid Cloud Optimized GeoTIFF
+            self.assertTrue(valid_cogeo(task.assets_path(task.ASSETS_MAP["orthophoto.tif"])))
+            self.assertTrue(valid_cogeo(task.assets_path(task.ASSETS_MAP["dsm.tif"])))
+            self.assertTrue(valid_cogeo(task.assets_path(task.ASSETS_MAP["dtm.tif"])))
+
             # A textured mesh archive file should exist
             self.assertTrue(os.path.exists(task.assets_path(task.ASSETS_MAP["textured_model.zip"]["deferred_path"])))
 
@@ -478,8 +491,48 @@ class TestApiTask(BootTransactionTestCase):
                     self.assertEqual(i.width, 512)
                     self.assertEqual(i.height, 512)
 
-            # TODO: Test hillshade
+            # Cannot access tile 0/0/0
+            res = client.get("/api/projects/{}/tasks/{}/orthophoto/tiles/0/0/0.png".format(project.id, task.id))
+            self.assertEqual(res.status_code, status.HTTP_404_NOT_FOUND)
 
+            # Can access hillshade, formulas, bands, rescale, color_map
+            params = [
+                ("dsm", "color_map=jet_r&hillshade=3&rescale=150,170", status.HTTP_200_OK),
+                ("dsm", "color_map=jet_r&hillshade=0&rescale=150,170", status.HTTP_200_OK),
+                ("dsm", "color_map=invalid&rescale=150,170", status.HTTP_400_BAD_REQUEST),
+                ("dsm", "color_map=jet_r&rescale=invalid", status.HTTP_400_BAD_REQUEST),
+                ("dsm", "color_map=jet_r&rescale=150,170&hillshade=invalid", status.HTTP_400_BAD_REQUEST),
+
+                ("dtm", "hillshade=3", status.HTTP_200_OK),
+                ("dtm", "hillshade=99999999999999999999999999999999999", status.HTTP_200_OK),
+                ("dtm", "hillshade=-9999999999999999999999999999999999", status.HTTP_200_OK),
+                ("dtm", "hillshade=0", status.HTTP_200_OK),
+
+                ("orthophoto", "hillshade=3", status.HTTP_400_BAD_REQUEST),
+
+                ("orthophoto", "formula=NDVI&bands=RGN", status.HTTP_200_OK),
+                ("orthophoto", "formula=VARI&bands=RGN", status.HTTP_400_BAD_REQUEST),
+                ("orthophoto", "formula=VARI&bands=RGB", status.HTTP_200_OK),
+                ("orthophoto", "formula=VARI&bands=invalid", status.HTTP_400_BAD_REQUEST),
+                ("orthophoto", "formula=invalid&bands=RGB", status.HTTP_400_BAD_REQUEST),
+
+                ("orthophoto", "formula=NDVI&bands=RGN&color_map=rdylgn&rescale=-1,1", status.HTTP_200_OK),
+                ("orthophoto", "formula=NDVI&bands=RGN&color_map=rdylgn&rescale=1,-1", status.HTTP_200_OK),
+
+                ("orthophoto", "formula=NDVI&bands=RGN&color_map=invalid", status.HTTP_400_BAD_REQUEST),
+            ]
+
+            for k in algos:
+                a = algos[k]
+                filters = get_camera_filters_for(a)
+                self.assertTrue(len(filters) > 0, "%s has filters" % k)
+
+                for f in filters:
+                    params.append(("orthophoto", "formula={}&bands={}&color_map=rdylgn".format(k, f), status.HTTP_200_OK))
+
+            for tile_type, url, sc in params:
+                res = client.get("/api/projects/{}/tasks/{}/{}/tiles/17/32042/46185.png?{}".format(project.id, task.id, tile_type, url))
+                self.assertEqual(res.status_code, sc)
 
             # Another user does not have access to the resources
             other_client = APIClient()
@@ -709,9 +762,10 @@ class TestApiTask(BootTransactionTestCase):
             self.assertFalse('orthophoto_tiles.zip' in res.data['available_assets'])
             self.assertTrue('textured_model.zip' in res.data['available_assets'])
 
-            image1.close()
-            image2.close()
-            gcp.close()
+        image1.close()
+        image2.close()
+        multispec_image.close()
+        gcp.close()
 
     def test_task_auto_processing_node(self):
         project = Project.objects.get(name="User Test Project")
diff --git a/app/tests/test_api_task_import.py b/app/tests/test_api_task_import.py
index 7cf287ae..fb557501 100644
--- a/app/tests/test_api_task_import.py
+++ b/app/tests/test_api_task_import.py
@@ -9,6 +9,7 @@ from rest_framework import status
 from rest_framework.test import APIClient
 
 import worker
+from app.cogeo import valid_cogeo
 from app.models import Project
 from app.models import Task
 from app.tests.classes import BootTransactionTestCase
@@ -115,6 +116,10 @@ class TestApiTask(BootTransactionTestCase):
             res = client.get("/api/projects/{}/tasks/{}/assets/odm_orthophoto/odm_orthophoto.tif".format(project.id, file_import_task.id))
             self.assertEqual(res.status_code, status.HTTP_200_OK)
 
+            self.assertTrue(valid_cogeo(file_import_task.assets_path(task.ASSETS_MAP["orthophoto.tif"])))
+            self.assertTrue(valid_cogeo(file_import_task.assets_path(task.ASSETS_MAP["dsm.tif"])))
+            self.assertTrue(valid_cogeo(file_import_task.assets_path(task.ASSETS_MAP["dtm.tif"])))
+
             # Set task public so we can download from it without auth
             file_import_task.public = True
             file_import_task.save()