# Inconsistent Map Rendering Bug **URL:** \ **Category:** MVC\ **Created:** [April 7, 2014, 4:58pm UTC](https://community.thinkgeo.com/t/inconsistent-map-rendering-bug/4164 "2014-04-07T16:58:53Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Michael12](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/m/ec9cab/32.png) [@Michael12](https://community.thinkgeo.com/u/Michael12)\ **Post date:** [April 7, 2014, 4:58pm UTC](https://community.thinkgeo.com/t/inconsistent-map-rendering-bug/4164/1 "2014-04-07T16:58:53Z")
I’m just learning how to use the Map Suite MVC Edition for use in a project and have encountered odd behavior.  The code is very rough and dirty, as this is just me playing around with some of the features in a practice project and making sure the client’s data loads. It’s modeled after the Quick Start guide and a few others.  The basic idea for this test is to have an OpenStreetMaps base layer and then using the layer selection tool to toggle some additional layers based on data from the client.  I am getting inconsistent behavior when it comes to rendering the page.  Sometimes the either one or both areas will have holes in them where that particular layer just doesn’t render.  Other times, the whole layer fails to render with the message "points must form a closed linestring" displayed on top of the map in the top left corner near the zoom and pan tools.  The most perplexing thing is that it seems to change between working seemingly correctly or giving the above behaviors simply from panning or zooming with no discernible consistency to help me narrow down why. Furthermore, it doesn’t appear to be consistent between each time I attempt to run the code. I’ve attached a zip containing a screen grab showcasing the hole. The hole is roughly near the center of the picture. One layer is set to render in a partially transparent red, while the other is set to render in a partially transparent blue. The blue area in the purple blob shows where the red layer isn’t rendering.  Here is the code block I’m using to setup and render the map.  The two shapefiles referenced are the client’s data which are in NAD83 projection(EPSG:4269). > `Html.ThinkGeo().Map(``"Map1"``, ``new` `System.Web.UI.WebControls.Unit(100, System.Web.UI.WebControls.UnitType.Percentage),``new` `System.Web.UI.WebControls.Unit(100,System.Web.UI.WebControls.UnitType.Percentage))  ` > `    ``.MapBackground(``new` `BackgroundLayer(``new` `GeoSolidBrush(GeoColor.FromHtml(``"#E5E3DF"``))))` > `    ``.CurrentExtent(-8926320, 4948463, -8878542, 4909473)` > `    ``.MapUnit(GeographyUnit.Meter)  ` > `    ``.MapTools(tools =>  ` > `    ``{  ` > `        ``tools.MouseCoordinateMapTool().Enabled(``true``);` > `        ``tools.OverlaySwitcherMapTool().Enabled(``true``);` > `    ``})  ` > `    ``.CustomOverlays(overlays => ` > `        ``{` > `            ``overlays.OpenStreetMapOverlay(``"Open Street Map"``);` > `            `  > `            ``//Projection from NAD83 to OpenStreetMaps` > `            ``Proj4Projection proj4 = ``new` `Proj4Projection();` > `            ``proj4.InternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(4269);` > `            ``proj4.ExternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(3857);` >   > `            ``// Zip Layer` > `            ``FeatureLayer ziplayer = ``new` `ShapeFileFeatureLayer(Server.MapPath(@``"\App_Data\Zips.shp"``));` >   > `            ``ziplayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle =` > `                ``AreaStyles.CreateSimpleAreaStyle(GeoColor.FromArgb(50, GeoColor.StandardColors.Red), GeoColor.StandardColors.Purple);` >   > `            ``ziplayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle =` > `                ``TextStyles.CreateSimpleTextStyle(``"ZIP"``, ``"Arial"``, 8, DrawingFontStyles.Regular, GeoColor.StandardColors.Black);` > `            ``ziplayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;` > `           `  >   > `            `  > `            ``proj4.Open();` >   > `            ``ziplayer.FeatureSource.Projection = proj4;` >   > `            ``ClientCache mapCache = ``new` `ClientCache(``new` `TimeSpan(1, 0, 0),``"mapCache"``);` >   > `            ``overlays.LayerOverlay(``"Zip"``, ``false``, TileType.SingleTile).Layer(ziplayer).ClientCache(mapCache);` > `            `  > `            `  >   > `            ``//Zone Layer` > `            ``ShapeFileFeatureLayer zoneLayer = ``new` `ShapeFileFeatureLayer(Server.MapPath(@``"\App_Data\Zones.shp"``));` > `            `  > `            ``zoneLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle=` > `                 ``AreaStyles.CreateSimpleAreaStyle(GeoColor.FromArgb(50, GeoColor.StandardColors.Blue), GeoColor.StandardColors.Green);` > `            ``zoneLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle =` > `                ``TextStyles.CreateSimpleTextStyle(``"ZONE"``, ``"Arial"``, 8, DrawingFontStyles.Regular, GeoColor.StandardColors.Chartreuse);` > `            ``zoneLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;` >   > `            ``proj4.Open();` > `            `  > `            ``zoneLayer.FeatureSource.Projection = proj4;` >   > `            ``overlays.LayerOverlay(``"Zones"``, ``false``, TileType.SingleTile).Layer(zoneLayer).ClientCache(mapCache);                        ` > `  `  > `        ``})` > `    ``.Render(); ` ---
**Author:** ![Johnny](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/johnny/32/19044_2.png) [@Johnny](https://community.thinkgeo.com/u/Johnny)\ **Post date:** [April 9, 2014, 2:43am UTC](https://community.thinkgeo.com/t/inconsistent-map-rendering-bug/4164/2 "2014-04-09T02:43:27Z")
Hi Michael, Thanks for paying attention to Map Suite products. Seems like there are something wrong with the data used for the toggle, but not very sure, it’s better you can call the MakeValid method of Feature to correct these geometries at first. Also I think you can try downloading our straightforward tool [GisEditor](http://thinkgeo.com/gis-editor/) to load these data and switch to “Identify Feature” tab to see how these holes are, what’s the type of these features, etc.  Also is it possible to send some demo data to us, so that we can do some test? because it’s hard for us to determine the problem just based on an image, you can attached in the thread or send it to us via email [forumsupport@thinkgeo.com](mailto:forumsupport@thinkgeo.com). Looking forward to your further information. Regards, Johnny ---
**Author:** ![Michael12](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/m/ec9cab/32.png) [@Michael12](https://community.thinkgeo.com/u/Michael12)\ **Post date:** [April 9, 2014, 10:33am UTC](https://community.thinkgeo.com/t/inconsistent-map-rendering-bug/4164/3 "2014-04-09T10:33:04Z")
I will need to check with the client before releasing the data.  One set of data is I believe simply from the U.S. Census, but the other may be their own private data.  Everything appears alright upon examination in GisEditor. I have also switched over to doing all setup in the controller since that more closely resembles how the project will be setup and is how I prefer to code.  I’ll post the updated code shortly, through the problem still exists as the its basically just transferring the code to the controller.       Also, as an experiment I tried something slightly different.  Instead of creating two LayerOverlays (one for each layer containing information from a shapefile) and adding them to the overlays collection, I created a single LayerOverlay and added both layers to it. When this is done the problem doesn’t appear to manifest.  Can there only be one LayerOverlay per a map? If so am I misunderstanding the purpose of the LayerOverlay? ---
**Author:** ![Michael12](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/m/ec9cab/32.png) [@Michael12](https://community.thinkgeo.com/u/Michael12)\ **Post date:** [April 9, 2014, 11:00am UTC](https://community.thinkgeo.com/t/inconsistent-map-rendering-bug/4164/4 "2014-04-09T11:00:29Z")
Here’s the updated code: The Controller: > `using` `System;` > `using` `System.Collections.Generic;` > `using` `System.Linq;` > `using` `System.Web;` > `using` `System.Web.Mvc;` > `using` `ThinkGeo.MapSuite.Core;` > `using` `ThinkGeo.MapSuite.MvcEdition;` >   > `namespace` `Test2.Controllers` > `{` > `    ``public` `class` `HomeController : Controller` > `    ``{` > `        ``//` > `        ``// GET: /Home/` >   > `        ``public` `ActionResult Index()` > `        ``{      ` > `            ``System.Web.UI.WebControls.Unit mapHeight = ``new` `System.Web.UI.WebControls.Unit(100, System.Web.UI.WebControls.UnitType.Percentage);` > `            ``System.Web.UI.WebControls.Unit mapWidth = ``new` `System.Web.UI.WebControls.Unit(100, System.Web.UI.WebControls.UnitType.Percentage);` >   > `            ``//Setup Map` > `            ``Map map = ``new` `Map(``"Map1"``,mapWidth,mapHeight);           ` > `            ``map.CurrentExtent = ``new` `RectangleShape(-8926320, 4948463, -8878542, 4909473);` > `            ``map.MapUnit = GeographyUnit.Meter;` > `            ``map.MapBackground = ``new` `BackgroundLayer(``new` `GeoSolidBrush(GeoColor.StandardColors.Beige));` > `            ``map.MapTools.OverlaySwitcher.Enabled = ``true``;` >   > `            ``//Setup Overlays` >   > `            ``//OSM` > `            ``map.CustomOverlays.Add(``new` `OpenStreetMapOverlay(``"OSM"``));` >   > `            ``//Projection from NAD83 to OpenStreetMaps` > `            ``Proj4Projection proj4 = ``new` `Proj4Projection();` > `            ``proj4.InternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(4269);` > `            ``proj4.ExternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(3857);` >   > `            ``//Cache client side` > `            ``ClientCache mapCache = ``new` `ClientCache(``new` `TimeSpan(1, 0, 0), ``"mapCache"``);` >   > `            ``//Setup Zip Layer` > `            ``LayerOverlay zipLayerOverlay = ``new` `LayerOverlay(``"Zip Codes"``, ``false``, TileType.SingleTile);` >   > `            ``ShapeFileFeatureLayer zipLayer = ``new` `ShapeFileFeatureLayer(Server.MapPath(@``"\App_Data\Zips.shp"``));` > `            ``zipLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle =` > `                ``AreaStyles.CreateSimpleAreaStyle(``new` `GeoColor(50, GeoColor.StandardColors.Red),GeoColor.StandardColors.DarkRed);` > `            ``zipLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle = ` > `                ``TextStyles.CreateSimpleTextStyle(``"ZIP"``, ``"Arial"``, 10, DrawingFontStyles.Regular, GeoColor.StandardColors.DarkRed);` > `            ``zipLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;` > `            ``proj4.Open();` > `            ``zipLayer.FeatureSource.Projection = proj4;` > `            ``proj4.Close();` > `            ``zipLayerOverlay.Layers.Add(zipLayer);` > `            ``zipLayerOverlay.ClientCache = mapCache;` > `            `  > `            ``map.CustomOverlays.Add(zipLayerOverlay);` >   > `            ``//Setup Zone Layer` > `            ``LayerOverlay zoneLayerOverlay = ``new` `LayerOverlay(``"Zones"``, ``false``, TileType.SingleTile);` >   > `            ``ShapeFileFeatureLayer zoneLayer = ``new` `ShapeFileFeatureLayer(Server.MapPath(@``"\App_Data\Zones.shp"``));` > `            ``zoneLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle =` > `                ``AreaStyles.CreateSimpleAreaStyle(``new` `GeoColor(50, GeoColor.StandardColors.Blue),GeoColor.StandardColors.DarkBlue);` > `            ``zoneLayer.ZoomLevelSet.ZoomLevel01.DefaultTextStyle = ` > `                ``TextStyles.CreateSimpleTextStyle(``"ZONE_NAME"``, ``"Arial"``, 10, DrawingFontStyles.Regular, GeoColor.StandardColors.DarkBlue);` > `            ``zoneLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;` > `            ``proj4.Open();` > `            ``zoneLayer.FeatureSource.Projection = proj4;` > `            ``proj4.Close();` > `            ``zoneLayerOverlay.Layers.Add(zoneLayer);` > `            ``zoneLayerOverlay.ClientCache = mapCache;` > `            ``map.CustomOverlays.Add(zoneLayerOverlay);` > `     `  > `            ``return` `View(map);` > `        ``}` >   > `    ``}` > `}` The View: > `@``using` `ThinkGeo.MapSuite.Core` > `@``using` `ThinkGeo.MapSuite.MvcEdition` > `@model ThinkGeo.MapSuite.MvcEdition.Map` >   > `@{` > `    ``ViewBag.Title = ``"Index"``;` > `}` >   > `

Index

` > `@{` > `    ``Html.ThinkGeo().Map(Model).Render();` > `    `  > `}` > `` ---
**Author:** ![Michael12](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/m/ec9cab/32.png) [@Michael12](https://community.thinkgeo.com/u/Michael12)\ **Post date:** [April 9, 2014, 12:12pm UTC](https://community.thinkgeo.com/t/inconsistent-map-rendering-bug/4164/5 "2014-04-09T12:12:39Z")
The client has given permission to release the data.  Here are the shapefiles, as well as the ancillary files, for the data. ---
**Author:** ![Johnny](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/johnny/32/19044_2.png) [@Johnny](https://community.thinkgeo.com/u/Johnny)\ **Post date:** [April 10, 2014, 4:34am UTC](https://community.thinkgeo.com/t/inconsistent-map-rendering-bug/4164/6 "2014-04-10T04:34:04Z")
Hi Michael, I think that it is a bug in our projection system when all the layers share only one instance of projection on “SingleTile” mode. I tried resolving it, but seems like it's a bit complicated, I have entered this issue to our internal issue tracking system, and hope it can be fixed soon. Now, I guess you can try the following two options:     - 1. Apply different instance of Projection to each layer, code should be as following:     -                                            Proj4Projection proj4 = new Proj4Projection();                 proj4.InternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(4269);                 proj4.ExternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(3857);                 Proj4Projection proj41 = new Proj4Projection();                 proj41.InternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(4269);                  proj41.ExternalProjectionParametersString = Proj4Projection.GetEpsgParametersString(3857);                  zipLayer.FeatureSource.Projection                 = proj4;                 zoneLayer.FeatureSource.Projection                 = proj41;                                                      - 2. Setting “TileType” property in “Overlay” to "MultipleTile". `zipLayerOverlay.TileType = TileType.MultipleTile; ` Thanks, Johnny