Help documentation for running the remote sensing tool.

 

Detailed steps for installing hdf viewer and the SATET program. 

Steps for setting up correct directories:

The program can not be run from an external drive but must be run on the C drive because of the paths. Consequently conduct the following steps to load and run on the C drive. The data can be on an external drive. Consequently down load data for modus from MODIS L1B raw data:
http://rapidfire.sci.gsfc.nasa.gov/realtime/?calendarThis is
Near-Real-Time Level-2 data that contain the data of the sensor not processed.

 

 

1.    Uncompress the hdf-java-v-1.zip file to C drive; the folder name must be C:\hdf-java

 

 

 

  1. Then run  hdfview.bat in the folder of C:\hdf-java\bin

 

 

 

 

 

Steps for using satet program to calculate ET for a given MODIS data file.

 

 

1. Run the hdfview.bat file.

 

 

 

 

2. Open an hdf file for viewing. (the example is the data on day 239 in 2005;the date information can be seen in the data file name)

 

 

 

 

 

 

 

 

 

 

 

 

 

3. click convert hdf to txt on the file menu

 

 

4. This is how the GUI will appear when completed converting.

 

 

 

5. Run satet by clicking  on the Satet menu item on the menu bar.

 

 

6. When the satet window opens you can load all bands from the file menu.

    Open mod1.txt, which will be found on the C: directory. mod1.txt has the information of the txt files that were just outputted from the third step. Default txt files are created in    the C: directory.

   

 

 

7. It will take some time to load the file. The progress bar indicates how far the task is from completion

 

 

 

 

8. On completion, enter the weather data and click on the Calculate Intermediate Bands button.

 

The appendix section shows one example how to get weather data for Las Cruces, NM using the http://weather.nmsu.edu/  website (New Mexico Climate Center).

For the areas of interest in other states, you may choose other corresponding Climate Center’s websites.

 

 

 

 

9. On completion find Temperature entry on the scroll pane. Single click the entry to open a graph view.

 

 

10. Set the hot point and cold point by locating the corresponding points on the graph.

 

10.1 Choosing an appropriate Cold Spot

Cold Spot should be chosen such that it is a vegetation area near the area of interest. For example for a cold spot near Roosevelt Lake, Arizona, the vegetation area marked in Figure 1 is appropriate.

 

 

Figure 1:  taken from Googleearth.

 

As a second example, for finding a cold spot near Elephant Butte Lake, a vegetation point located in the Las Cruces area is appropriate.

 

 

Figure 2: taken from Googleearth.

10.2 Procedure for setting the hot point and cold point

 

  (10.2.1) Choose a suitable rectangular area where a possible Hot spot can be found.

·        Click on the top left point of that area then click on the Set TL button.

·        Click on the bottom right point of that area and then click on the Set BR button.

 

 

 

 

(10.2.2) Click on the Set Hot Point button, this will automatically set the Hot point to the maximum temperature point found in the region.

 

 

 

 

 

After clicking on the Set Hot Point button, a popup will be displayed indicating the hot point found. Click Ok to set the Hot Point as this point.

 

 

 

 

 

(10.2.3)(If you followed step 10.2.1, you can skip this step) Alternatively you can choose a suitable hot point manually in the graph by clicking one point. The temperature value and latitude and longitude coordinates of the current chosen point can be seen on the left side of the display (322.99 K) just above the Set Hot Point button. After choosing a hot spot click the Set Hot Point button.

 

 

 

Figure: Here a suitable hot point (322.94K) is chosen for Elephant Butte Reservoir.

 

 

(10.2.4)    (If you followed step 10.2.1, you can skip this step) Click on the Set Roughness Point 1 button (the hot spot is a desert area).

     

 

 

 

 

(10.2.5)Choose a suitable rectangular area where a possible Cold spot can be found.

·        Click on the top left point of that area then click on the Set TL button.

·        Click on the bottom right point of that area and then click on the Set BR button.

 

 

 

Figure: The TL and BR points are shown.

 

(10.2.6) Click on the Set Cold Point button, this will automatically set the cold point to the lowest temperature point found in the region.

 

 

Figure: The Set Cold Point button

 

 

(10.2.7)  (If you followed step 10.2. 5, you can skip this step)

 Alternatively you can manually choose and set a suitable cold point in the graph. The temperature value and latitude and    longitude coordinates of the current chosen point can be seen on the left side of the display (303.21 K). After choosing a cold spot click on the Set Cold Point button.

 

 

 

Figure: Here a suitable cold point (303.21K) is chosen for Elephant Butte Reservoir.

 

(10.2.8)(If you followed step 10.2.5, you can skip this step) Click on the Set Roughness Point 2 button. (the vegetation is pecan plants, the height is 12 m; otherwise, input appropriate height instead of 12)

   

 

 

 

 

11. After setting the Hot and the Cold points, single click on the Calculate ET Band button.

 

 

 

 

 

12. On completion you can click once on the ET entry on the scroll pane to open a graph view. On the graph you can click on a point and ET value is displayed on the left hand display.

 

 

Figure: Here the ET value for the chosen point is 3.47 mm/day.

 

13. Steps for Saving ET Band

 

 

  1. Select “Save Selected Band” from the File menu.
  2. Select an appropriate location to save.

 

 

 

 

 

 

 

  1. Open the saved .bnd file using a text editor.

 

 

 

 

  1. Find ET in the text file and delete all rows above the red line shown in the figure.

 

 

 

  1. Save the edited file.

 

 

 

 

Steps to import this data into hdview to display in color:

 

  1. Open HDFView

     

 

 

  1. Click on the File Menu then New and then choose HDF5.

 

 

 

8. Provide a File Name

 

 

 

 

 

9. Right click on the newly created file, and then select New and then Dataset.

 

 

 

 

10.  Enter a Dataset name, select Datatype class as FLOAT, No. of dimensions as 3. Enter the Current size as obtained from step 4.

 

 

 

11.    Right click on the dataset on the left pane and then click on Open.

 

 

 

12.  Click on the Table menu. Select Import Data from File and then located the file which was obtained from step 5 in the File dialog box.

 

 

 

13.  Click on the Table menu and the click on

 

 

 

 

14. Right click on the dataset and then select Open As.

 

 

14. Select Image and then click on Ok.

 

 

 

 

15. Click on the Im tab and then select Change Palette.

 

 

 

 

 

16. Select a palette of choice and then click Ok.

 

 

 

 

 

 

     APPENDIX

 

The following material shows step by step directions on how to get weather data from a weather station using the http://weather.nmsu.edu/ web site.

 

  1. go to http://weather.nmsu.edu/ and click on the NMCC Climate Station Data link.

 

 

 

 

 

  1. Click on the Hourly link

 

 

 

3. Choose Leyendecker PSC (Plant Science Farm) weather station from the scroll menu.

 

 

 

 

  1. Select the appropriate date and click Submit.

 

 

 

 

  1. Choose Hour 1200 (the satellite overpass time over Las Cruces area) and select the data required from the relevant fields.

 

 

Steps for getting Etr from the same website

 

  1. go to http://weather.nmsu.edu/ and click on the NMCC Climate Station Data link.

 

 

 

 

2. Click on the Irrigation Management and GDD Climate Data Retrieval System link

 

 

 

 

 

 

3. Choose an appropriate weather station from the links on the right, must input January 1 and the year of interest for the start date. Enter the date for which Etr reading is   required as the end date. For example here the end date is set as May 1 2006.

Choose METRIC units and select the “Generate Crop Coefficient and ET” selection item.  Select Alfalfa from the “Present Defaults” scroll menu.

 

 

 

 

4.  Click on Retrieve Weather Data button. Select P-M ET (Tall Ref.) cm field from the last row to get the required Etr value. To input the following Etr value in satet, please convert this value to millimeters.

 

 

 

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