Raster Layers

You can use a raster layer to add a raster image background to the map.

There can only be one raster layer in a style; however that raster layer can contain many GeoTiff (.tif ) or JPG (.jpg) files. You can add and remove files from this single layer.

If you pick a GeoTiff file with no header or a JPG on its own then it will be placed it at the current map position (as there is no spatial information associated with it). If you also select the associated raster positioning file (.jpgw, .tifw, or .tfw) then it uses this added spatial information to position the image in the right place.

Note: If you are using raster positioning files (also known as "world" files) they must have the same name as their corresponding raster file (e.g. raster.tif and raster.tifw).

Note: 1Edit does not support the use of GeoTiff header metadata contained as a transformation matrix.

Adding a Raster Layer

To add a raster layer, open the Styles page from the lower app bar and click the Raster Layer button.

Click Add Raster, then navigate to the file you want to use, select it, and click Open.

Note: If adding a world file alongside your image file, you must select both files at the same time. If using a keyboard, hold Ctrl to use multi-select.

Only GeoTiff files that are in the same SRID as the vector data are shown. Adjust the Opacity if required.

Note: When adding files to the raster layer, they are copied to the project. Any changes made to the raster image (see Transforming Raster Images) are made locally within the project and will not be copied back to the original files.

Note: 1Edit uses the Windows libraries for displaying GeoTIFFs and only some compression techniques are supported by Windows. When saving the GeoTIFF files, use the JPG compression technique and the BIP interleaving type to ensure the images can be loaded by 1Edit.
A good test is to view the image file in Windows Explorer to see if it can show you a thumbnail. A visible thumbnail means that 1Edit should be able to display the GeoTIFF.

Transforming Raster Images

Images within the Raster layer can be transformed (re-positioned) by describing two vectors in Raster Transform mode. The two vectors will apply a uniform scale, shift and rotate to the image.

Note: When in Raster Transform mode, you cannot edit or select data.

Transform a Raster image

1. Open the Upper and Lower App Bars by right-clicking with the mouse, pressing Windows + z on a keyboard, or swiping up from the bottom on a touch screen.

   Navigate to Data > Raster Transform.

2. Choose your image file from the File Name drop-down list.

3. Navigate to the part of the map containing your raster image.

4. Click to edit vector 1, then define the vector by clicking two points on the map.

   Note: Define the vector by first clicking on a point in your raster image, then in the corresponding point in your data. Make sure you define both vectors in the same order.

5. Repeat this process for vector 2.

   

   Defining the two vectors to transform the raster image

6. Click Preview to see how your two vectors would transform the raster.

   

   The transformed raster

7. You can now either accept the transformation, or edit your vectors until you are happy with the preview.

   • Click Save to accept the changes and repeat the process to tweak the transformation if necessary.
   • Click Cancel Preview to undo the changes and re-draw the vectors.

8. You can now either repeat the process with another pair of vectors, click Revert to undo the changes, or click Close to exit Raster Transform mode.