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Standard Distance / Deviation Ellipse



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Author Dr Michael Sawada
File Name stdist.zip
Language Visual Basic
Last Modified Jul 6 2002
Status of work Public Domain
Software ArcGIS Desktop
File Size 284.66 kb
Downloads 1931

ArcScripts is intended for the free exchange of scripts and tools related to ESRI software products. Please alert the moderator if this script is a demo, trial-version, or an advertisement for a retail product.

Summary
This program presents a user interface with a dropdown list of all point layers in the current DataFrame and allows the calculation of

1. Standard Distance (SD) with mean-center of all points, or a
2. Standard Deviational Ellipse (SDE).

within the current map projection. Output is placed as graphic elements (Lines, Polygons and Callout Balloons with text) within the current DataFrame. Vital parameters of each are reported in a text-box.

See the README.PDF document in the download file.

Program options available are:

1. Calculate the Standard Distance or Standard Deviation Ellipse.
2. Calculate SD/SDE at a given level of deviation e.g., 1-SD, 2-SD…
3. Choose to automatically select points in the current layer that are within the SD/SDE polygon.
4. Choose to calculate the SD/SDE only on a selected subset of points within the layer being analyzed.
5. Option to delete all graphics in the current dataframe.

Outputs:

1. Graphics on DataFrame.
2. Textual on user interface.

Written in Visual Basic and requires ArcGIS 8.1. A single DLL is to be loaded using the customize interface.

1) Extract the .dll from the zipped file and place it in a folder on your harddrive (remember where you've put it!). The file is called stdist.dll
2) Load the .dll into ArcMap by

a. Right clicking on any gray area in the menu bar
b. Select Customize… from the 'pop-up' menu
c. Select the Commands tab at the top of the dialog box.
d. Select the "Add from file" button.
e. Navigate to the folder where the stdist.dll was placed and double-click on it.
f. Under the categories, click on Sawada and you will see an icon for the Standard Distance. DON'T CLICK THE CLOSE BUTTON YET!!!!
g. Next, click on the drop-down arrow in the bottom left corner and ensure that it says "Normal.mxt"
h. Now, drag that Icon to one of the button-bars in ArcGIS
i. Click on the "Close" button
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