# TIFFwith World File no Showing **URL:** \ **Category:** WPF\ **Created:** [September 28, 2011, 5:40am UTC](https://community.thinkgeo.com/t/tiffwith-world-file-no-showing/3075 "2011-09-28T05:40:31Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![Michael4](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/michael4/32/24915_2.png) [@Michael4](https://community.thinkgeo.com/u/Michael4)\ **Post date:** [September 28, 2011, 5:40am UTC](https://community.thinkgeo.com/t/tiffwith-world-file-no-showing/3075/1 "2011-09-28T05:40:31Z")
I am loading a TIFF using the following code, but the image does not appear.  Is there something wrong (maybe with the World File?  I downloaded the image from TerraServer and it came with the World File. `    Private Sub AddRasterImage(ByVal filePath As String, ByVal OverlayKey As String)        Dim worldImageLayer As GdiPlusRasterLayer = New GdiPlusRasterLayer(filePath)        AddHandler (CType(worldImageLayer.ImageSource, GdiPlusRasterSource)).StreamLoading, AddressOf Image_StreamLoading        worldImageLayer.UpperThreshold = Double.MaxValue        worldImageLayer.LowerThreshold = 0        worldImageLayer.IsGrayscale = False        Dim ImageOverlay As LayerOverlay = New LayerOverlay()        ImageOverlay.Layers.Add(OverlayKey & "Layer", worldImageLayer)        WpfMap1.Overlays.Add(OverlayKey & "Overlay", ImageOverlay)        WpfMap1.Overlays.MoveToBottom(WpfMap1.Overlays.IndexOf(ImageOverlay))    End Sub    Private Sub Image_StreamLoading(ByVal sender As Object, ByVal e As StreamLoadingEventArgs)        If e.StreamType = "Image File" Then            Dim stream As IO.Stream = New FileStream(e.AlternateStreamName, FileMode.Open, FileAccess.Read)            e.AlternateStream = stream        End If        If e.StreamType = "World File" Then            Dim fName As String = IO.Path.GetFullPath(e.AlternateStreamName)            Select Case IO.Path.GetExtension(e.AlternateStreamName).ToUpper                Case ".TIF"                    fName = fName.Substring(0, fName.Length - 3) & "tfw"                Case ".JPG"                    fName = fName.Substring(0, fName.Length - 3) & "jgw"            End Select            Dim stream As IO.Stream = New FileStream(fName, FileMode.Open, FileAccess.Read)            e.AlternateStream = stream        End If    End Sub` The World File contains: 5.648000 0.000000 0.000000 -5.648000 573645.000000 2918226.000000   If I use: `        Dim worldImageLayer As GdiPlusRasterLayer = New GdiPlusRasterLayer(filePath, New RectangleShape(-80.26173, 26.38224, -80.1914, 26.31811))` without streaming, then the image shows up ---
**Author:** ![Gary2](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/g/49beb7/32.png) [@Gary2](https://community.thinkgeo.com/u/Gary2)\ **Post date:** [September 28, 2011, 12:59pm UTC](https://community.thinkgeo.com/t/tiffwith-world-file-no-showing/3075/2 "2011-09-28T12:59:47Z")
Hello Michael,      Thank you for your post.      I think the key is e.AlternateStream = stream, this is the only different with or without steaming.      Can you debug this part and compare the difference ?      Regards,      Gary ---
**Author:** ![Michael4](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/michael4/32/24915_2.png) [@Michael4](https://community.thinkgeo.com/u/Michael4)\ **Post date:** [September 28, 2011, 8:24pm UTC](https://community.thinkgeo.com/t/tiffwith-world-file-no-showing/3075/3 "2011-09-28T20:24:34Z")
If I put a debug.print statement before both e.AlternateStream = stream in the streamloading method, I get alternating world file and image file, but still no image on the map.  If I zoom in or out, I still see the alternating streaming. ---
**Author:** ![Michael4](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/michael4/32/24915_2.png) [@Michael4](https://community.thinkgeo.com/u/Michael4)\ **Post date:** [September 29, 2011, 5:46am UTC](https://community.thinkgeo.com/t/tiffwith-world-file-no-showing/3075/4 "2011-09-29T05:46:26Z")
Could it be the different projectons in the world file?  For instance, one of my worlld files is:   Geo-reference Information:    Projection: Geographic   Datum: WGS 84   Image Units: Meters      and the oher is:   Geo-reference Information:    Projection: UTM Zone 17   Datum: WGS 84   Image Units: Meters  ---
**Author:** ![Val](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/v/e56c9b/32.png) [@Val](https://community.thinkgeo.com/u/Val)\ **Post date:** [September 29, 2011, 9:40am UTC](https://community.thinkgeo.com/t/tiffwith-world-file-no-showing/3075/5 "2011-09-29T09:40:25Z")
Michael,       Let me interject in the conversation very quick. I am not familiar with the streaming issue but one thing that you need to make sure is to set the MapUnit of your map correctly. If you world file contains values like 573645 for the x-coordinate of the center of the upper left pixel and 2918226 for the y-coordinate, then the MapUnit has to be in Meters. The world file itself does not contain projection information, only the coordinates for the image to be placed geographically. ([en.wikipedia.org/wiki/World\_file](http://en.wikipedia.org/wiki/World_file)) . I just want to make sure we have that well established before trying to find the problem anywhere else. ---
**Author:** ![Michael4](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/michael4/32/24915_2.png) [@Michael4](https://community.thinkgeo.com/u/Michael4)\ **Post date:** [September 29, 2011, 9:16pm UTC](https://community.thinkgeo.com/t/tiffwith-world-file-no-showing/3075/6 "2011-09-29T21:16:22Z")
Good catch… that is probably the problem.  Now the question is, is there a way to use a world file in meters when the map is set as DecimalDegree?  Or do I just have to plan on putting the rectangle in? ---
**Author:** ![Val](https://community.thinkgeo.com/letter_avatar_proxy/v4/letter/v/e56c9b/32.png) [@Val](https://community.thinkgeo.com/u/Val)\ **Post date:** [September 30, 2011, 8:43am UTC](https://community.thinkgeo.com/t/tiffwith-world-file-no-showing/3075/7 "2011-09-30T08:43:28Z")
Michael,  No, if your image is in meters, you need to have your map unit also in that unit. Only in some specific situations you can trick an image into Decimal Degrees from Meters. I suggest you look at the sample code _Google Map to Geodetic _ so that you get a little more background on the issue. [wiki.thinkgeo.com/wiki/Map\_Suite\_De...o\_Geodetic](http://wiki.thinkgeo.com/wiki/Map_Suite_Desktop_Edition_Projection_Samples#Google_Map_to_Geodetic)  For your question "Do I just have to plan on putting the rectangle in?". I am not sure what you mean. ---
**Author:** ![ThinkGeo](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/thinkgeo/32/25029_2.png) [@ThinkGeo](https://community.thinkgeo.com/u/ThinkGeo)\ **Post date:** [September 30, 2011, 11:38am UTC](https://community.thinkgeo.com/t/tiffwith-world-file-no-showing/3075/8 "2011-09-30T11:38:39Z")
Micheal,      As the Val said, the image’s unit should be the same as the map unit and I think the sample project is useful for you.      For your question “Do I just have to plan on putting the rectangle in”, I guessed you talked about the extent for the map, if that, you should set the map’s current extent to the boundingbox of the image to display it.       Thanks,      Scott, ---
**Author:** ![Michael4](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/michael4/32/24915_2.png) [@Michael4](https://community.thinkgeo.com/u/Michael4)\ **Post date:** [October 1, 2011, 5:36pm UTC](https://community.thinkgeo.com/t/tiffwith-world-file-no-showing/3075/9 "2011-10-01T17:36:46Z")
Thanks Scott and Val.  What I meant by the rectangle is that I will not use the world file, but instead just display the image using:   Dim worldImageLayer As GdiPlusRasterLayer = New GdiPlusRasterLayer(filePath, New RectangleShape(-80.26173, 26.38224, -80.1914, 26.31811))  ---
**Author:** ![ThinkGeo](https://community.thinkgeo.com/user_avatar/community.thinkgeo.com/thinkgeo/32/25029_2.png) [@ThinkGeo](https://community.thinkgeo.com/u/ThinkGeo)\ **Post date:** [October 4, 2011, 3:21am UTC](https://community.thinkgeo.com/t/tiffwith-world-file-no-showing/3075/10 "2011-10-04T03:21:07Z")
Micheal,      Thanks for your explanations!      Yes, if you have the correct extent value for the image file, you don’t need to use the world file. But you need to set the extent correctly so that the image file display correctly.      Any more questions please let me know,      Thanks,      Scott,