INSTRUCTIONS FOR USING THE CUSTOM WATER QUALITY TOOLS IN ARCGIS
Before you start make sure you turn the 3D, Spatial analyst extension and any other extension you may need is turned on. The interpolation and animation tools will not work if you don't do this. You may have to repair the files as they may have lost their addresses as result of downloading them to a different folder. The only data you need to repair
1. Add the boundary feature of the water body being studied. This feature can be easily created in ArcGIS by importing a DEM in which the water boundary can be easily distinguished and digitizing the water boundary from it. The feature should be named “boundaryflat”.
2. Make sure your boundary is in the correct coordinate system.
3. To make the map look presentable, you could add a DEM of the surrounding area to the map to.
DESCRIPTION OF TOOLS AND THEIR USAGE
· Creating Feature points to Show monitoring points.
This tool allows a user to visualize the locations where monitoring was done upon clicking the CreateMonitoringPoints button. It also prompts you to ok labeling the features.
· Plotting Vertical profiles
This tool allows a user to plot vertical profiles at a point on the lake. It allows the plotting of up to two parameters at the same time so that a comparison can be made. It allows a user to choose between plotting a line graph and a scatter plot.
· Plotting Time Series
This tool plots a time series of a selected parameter at a certain depth for a specified time period. You can also plot time series of a profile as shown below. For the point time series you have the option of choosing as many parameters as you want but in order to display them in a sensible way parameters that have values that are close should be chosen together to show variations well.
· Interpolating data over the water body
The distribution button allows a user to choose a date, a depth and a parameter to do an interpolation over the entire lake to find out how the values may be distributed over the entire lake at a certain level to give a rough idea about how the lake looks overall. The spline method gave the best interpolation that mimicked what was actually happening on the lake
The animation tool allows a user to choose a day and a parameter and using the tool above, a raster is created for every level on the lake that day. A video is then made by gradually going through all the rasters at every depth each raster gradually fading into the next. The time series tab animates the changes that occur at the same level over time.
· Select Table and export
ArcGIS is limited in its ability to model water quality parameters. This feature allows a user to get part of the database to do some analysis.
I have a Scratch file Geodatabase where all intermediate data for the processes are stored. Make sure you empty it periodically to create room or else you might get an error when it is full. I am also working on making the monitoring points interactive so that it will automatically give you the choice of plotting graphs.
If any problems are encountered during the usage of these tools please feel free to contact me with them. All other comments and suggestions are welcome.
CALEB AMOA BUAHIN