1. Development of Linear Measure Tool using Application Framework
Venkatesh Merwade

2. Overview Necessity for Linear Referencing Application Framework
About Linear Measure Tool
PolylineM
LengthDown
Application of LMT
Conclusions, Acknowledgements, Questions!

3. Necessity for Linear Referencing
GIS often represents spatial information with two dimensional coordinate systems.
Location of river gauging station
x,y coordinates - (992506,301256)
Linear measure - HydroCode = 30021, m=165
Add route events
Find distance between two points and so on.

4. Application Framework What is it??
It’s an ArcMap extenstion
Designed to access ArcMap layers for input and create new output layers (right now used only for input).

5. Why AppFramework? Here is how it all works AppFramework
Get hold of MxDocument
Get hold of Map
Get hold of FeatureLayer
Get hold of FeatureClass
Get hold of required Field in FeatureClass
Do Something, have fun!
Display results
AppFramework

6. Sub LengthDown()
Dim pMxDoc As IMxDocument
Dim pMap As IMap
Set pMxDoc = ThisDocument
Set pMap = pMxDoc.FocusMap
Dim pFLayer As IFeatureLayer
Dim pFeature As IFeature
Set pFLayer = pMap.Layer(0)
Dim pFC As IFeatureClass
Set pFC = pFLayer.FeatureClass
Dim pTable As ITable
Set pTable = pFC
Dim j As Long
j = pTable.FindField(“LengthDown")
If j = -1 Then
MsgBox “Field not found"
Exit Sub
End If
MsgBox “Field Found”
End Sub

7. Linear Measure Tool (LMT)
It’s developed in Visual Basic as a DLL.
Uses AppFramework for input.
Register in ArcMap to use it.
Toolbar with some cool options for Linear Referencing.
Works only with PolylineM layer and uses LengthDown for multiple features option.

8. Why LMT is so cool! It has some cool options!
Assign Ms
Read Ms
Finds out distance between two points
Deals with both Individual and Multiple Features
Changes the MDomain on fly if necessary
It flashes but never crashes (sometimes gives error message, but that’s not LMT, it’s user!)

9. Application of LMT

10. Conclusions
Using Visual Basic, I can do some cool stuff too. It’s very easy.
Here we are dealing with only one type of Layer (PolylineM). AppFramework is more useful when dealing with different types of layers and fields.

11. Acknowledgements
Dr. Maidment
Tim Whiteaker
CRWR crew