DataSlate Tool calibration tutorial

Tutorial to set Latitude and Longitude for DataSlate SimpleStructs.

This tutorial assumes that:

Your images are rectangular ( in a SimpleStruct this is true).
That your images are oriented true north (you need to do this before you create your SimpleStruct with ServerGen).
That you are working with images in the Northern and Western Hemispheres (primarily North America)
The images are not so large that curvature of the earth is a large factor.

Text in RED will be directions. Text in BLACK is general information and explanations.

1) First you need to look at your image in DataSlate and determine two points as widely separated as possible that can be easily identified.

The separation will help eliminate some possible errors resulting in exact point selection. It is helpful to find reliable points in opposite corners or thereabouts. The two points must not lie along a horizontal or vertical line.

Space Imaging - The Visual Information Company has a section called CARTERRA Solution imagery. The URL is <http://carterraonline.spaceimaging.com/cgi-bin/Carterra/phtml/login.phtml> <http://mapserver.esri.com/si/html/main.htm> (opens a new window)

This site allows you to find a location by place name, latitude-longitude, address and others.

Selecting the URL will result in this image:

2) Click on the map and the magnifier in the upper left will allow you to enlarge the chosen spot.

For this example, we will choose 'Place Name' as the method of location.

3) Click on : Place Name.

A dialog box will appear. Enter the name of the location you desire. In this example, Ashland, Nebraska has been entered. You may enter the name of the county as well.

Press the SUBMIT button.

THEN..

Here is another look at the 'Magnifying' button.

4) A series of magnifying clicks on the marker called Ashland will 'zero' in on your selection.

When your pointer centers on the spot called 'Ashland', the 'Position' box will show the latitude and longitude for that location.

5) Another click takes you to street level, use the intersection of roads to determine locations accurately.

This will also remind you that a one pixel deviation makes a big difference.

Here is a look at a location which is close by Ashland.

This shows one of the spots chosen for the lat-lon determination for the 'mahoney.JPG' image. The chosen spot is the halfway point across the I-80 bridge. You will see this image further along in the tutorial.

In this step, it is extremely critical to be accurate!!! Zoom in on the spot that you are using until you can be definite in your location. Keep zooming in until there is no movement of lat/long. Then record the information.

One place that we chose to find the GPS for is the halfway point across the I-80 bridge the other is the center of the cloverleaf interchange of I-80 and Mahoney Park/SAC exit. Again it is critical to be accurate in your GPS location. Zoom in as far as possible to locate the GPS.

After you find the GPS for your points, you will input them into the spreadsheet that calculates the lat/long for the edges of the images.

Click here to continue

Space Imaging - The Visual Information Company has a section called CARTERRA Solution imagery. The URL is <http://carterraonline.spaceimaging.com/cgi-bin/Carterra/phtml/login.phtml> <http://mapserver.esri.com/si/html/main.htm> (opens a new window)	This site allows you to find a location by place name, latitude-longitude, address and others.
Selecting the URL will result in this image: 2) Click on the map and the magnifier in the upper left will allow you to enlarge the chosen spot.
For this example, we will choose 'Place Name' as the method of location. 3) Click on : Place Name. A dialog box will appear. Enter the name of the location you desire. In this example, Ashland, Nebraska has been entered. You may enter the name of the county as well. Press the SUBMIT button.	THEN..
Here is another look at the 'Magnifying' button. 4) A series of magnifying clicks on the marker called Ashland will 'zero' in on your selection.
When your pointer centers on the spot called 'Ashland', the 'Position' box will show the latitude and longitude for that location.
5) Another click takes you to street level, use the intersection of roads to determine locations accurately. This will also remind you that a one pixel deviation makes a big difference.
Here is a look at a location which is close by Ashland. This shows one of the spots chosen for the lat-lon determination for the 'mahoney.JPG' image. The chosen spot is the halfway point across the I-80 bridge. You will see this image further along in the tutorial. In this step, it is extremely critical to be accurate!!! Zoom in on the spot that you are using until you can be definite in your location. Keep zooming in until there is no movement of lat/long. Then record the information.

Space Imaging - The Visual Information Company has a section called CARTERRA Solution imagery. The URL is <http://carterraonline.spaceimaging.com/cgi-bin/Carterra/phtml/login.phtml> <http://mapserver.esri.com/si/html/main.htm> (opens a new window)

THEN..