Create a Georeferenced Image
In the map service, right click at the TOP LEFT CORNER of the area of interest and choose What’s here in Google and Add a pushpin in Bing
Lat Long displayed as:
Convert the above lat - long to UTM: Use standard UTM from:
Results: Easting 463286.4 Northing4764700.1
Screen capture (PrintKey 2000; set up Hotkey as Rectangular area using F10) – this example is 500x500 pixels. Save as jpg.
Right click file to confirm the properties.
Now the hard part: how wide is the jpg in feet or meters?
Use the best estimate you can by measuring known lengths on the ground or use this in Google:
How measurements are done with Bing is not documented here.
In the above example, in meters, 1000
Therefore each pixel is 2.0 metres wide and 2.0 metres tall. (1000 meters/500 pixels)
Now write the world file.
1st line: width of each pixel : 2.0
2nd line: x rotation : 0.0 -> virtually always
3rd line: y rotation : 0.0 -> virtually always
4th line: height of each pixel : -2.0 -> always negative
5th line: Easting at the center of the top left corner pixel : 463286.4+ (2.0/2) = 463287.4
6th line: Northing at the center of the top left corner pixel : 4764700.1 – (2.0/2) = 4764699.1
Note: for the sixth line, use a + sign (add) in the Southern hemisphere.
So the file is as follows:
2.0
0.0
0.0
-2.0
463287.4
4764699.1
Save the above in text mode (use Notepad) with a jpw or jgw extension with the same first name as the jpg file (Map.jpg). so, in this case, the file is called Map.jpw. jpw (or jgw) files are the world file for a jpg.
If a tif is stored, use tfw as the file extension for the world file.
Make sure the world file and the image (jpg and jpw, in this example) are in the same folder.
To test the image, AutoCAD Civil 3D 2016 is used.
Setting the coordinate system with the CSASSIGN command and turning on the Bing background map with the GEOMAP command (or Geolocation menu) to Aerial; and then using the MAPIINSERT command (MAP Image INSERT), open the image file created; the world file will correlate to the map.
OK
The image will be “off” a bit.
Use the MOVE command to move it into position.
Then use the ID command to identify the x and y (EASTING and NORTHING) coordinates of the top left corner. Place these two values into the world file (jpw or tfw) in place of the 5th (EASTING) and 6th (NORTHING) lines.
Now the image will fit into Infraworks.
In Infraworks, add the image as a Raster source of data.
Set the Coordinate System
The world file can also be built by AutoCAD Raster Design as a plug in to AutoCAD Civil 3D 2016, for example.
Use the ADERSHEET command too rubber sheet the image into position,
Choose the image file (jpg or tif) and choose a directory location for the world file. Place the image file and the jgw (jpw – both can be used as world files for jpg’s) into the same folder.
Insert the raster to Infraworks.