diff --git a/grails-app/controllers/au/org/ala/ecodata/AdminController.groovy b/grails-app/controllers/au/org/ala/ecodata/AdminController.groovy
index 67a21b83a..7772d7d6c 100644
--- a/grails-app/controllers/au/org/ala/ecodata/AdminController.groovy
+++ b/grails-app/controllers/au/org/ala/ecodata/AdminController.groovy
@@ -272,7 +272,8 @@ class AdminController {
         dateFormat.setTimeZone(timeZoneUTC)
         def isMERIT = params.getBoolean('isMERIT', true)
         Date startDate = params.getDate("startDate", ["yyyy", "yyyy-MM-dd"]) ?: dateFormat.parse(defaultStartDate)
-        List siteIds = params.get("siteId")?.split(",")
+        List siteIds = params.get("siteId")?.split(",") ?: []
+        List projectIds = params.get("projectId")?.split(",") ?: []
         def code = 'success'
         def total = 0
         def offset = 0
@@ -281,8 +282,14 @@ class AdminController {
         List<String> defaultFids = metadataService.getSpatialLayerIdsToIntersect()
         log.debug("Number of fids to intersect: ${defaultFids.size()}; they are - ${defaultFids}")
         def totalSites
-        List projectIds = []
-        if (siteIds) {
+        if (projectIds) {
+            projectIds.each {
+                siteIds.addAll(siteService.findAllSiteIdsForProject(it))
+            }
+
+            totalSites = siteIds.size()
+        }
+        else if (siteIds) {
             totalSites = siteIds.size()
         }
         else if (isMERIT) {
diff --git a/grails-app/services/au/org/ala/ecodata/SpatialService.groovy b/grails-app/services/au/org/ala/ecodata/SpatialService.groovy
index 82e3391a1..e48b1af84 100644
--- a/grails-app/services/au/org/ala/ecodata/SpatialService.groovy
+++ b/grails-app/services/au/org/ala/ecodata/SpatialService.groovy
@@ -4,10 +4,7 @@ import grails.core.GrailsApplication
 import grails.plugin.cache.Cacheable
 import groovy.json.JsonParserType
 import groovy.json.JsonSlurper
-import org.locationtech.jts.geom.Coordinate
-import org.locationtech.jts.geom.Geometry
-import org.locationtech.jts.geom.GeometryCollection
-import org.locationtech.jts.geom.GeometryFactory
+import org.locationtech.jts.geom.*
 import org.locationtech.jts.io.WKTReader
 
 import static ParatooService.deepCopy
@@ -73,8 +70,17 @@ class SpatialService {
                 correctGeometry = geometryCollection.buffer(0)
             }
 
-            Geometry convexHullGeometry = correctGeometry.union().convexHull()
-            wkt = convexHullGeometry.toText()
+            Geometry convexHullGeometry
+            try {
+                convexHullGeometry = correctGeometry.union().convexHull()
+            }
+            catch (TopologyException e) {
+                log.error("Error creating convex hull for geometry collection")
+                convexHullGeometry = correctGeometry.buffer(0).union().convexHull()
+            }
+            finally {
+                wkt = convexHullGeometry?.toText()
+            }
         }
 
         String url = grailsApplication.config.getProperty('spatial.baseUrl')+WKT_INTERSECT_URL_PREFIX