Friday, February 24, 2006

UW College of Ag personnel and students learn to analyze crop growth with Landsat images

Eleven UW College of Agriculture personnel and students learned how remote sensing technology can help distinguish patterns of good and poor growth in crops.  In a workshop conducted by WyomingView they learned to display and analyze remotely sensed images in ERDAS ViewFinder (EVF), a freeware image viewer.


Participants saw the value of Landsat's infrared bands for highlighting crop growth differences and how reflectance values in those bands can be related to growth patterns (or vigor).  They collected reflectance values of features such as crops, rangelands, water and built surfaces (asphalt roads) to gain insights about how each feature interacted with electromagnetic radiation.

Analysis of crops showed that variability in the near-infrared reflectance (band 4) values of Landsat can be associated with the patterns of crop growth within a field.

Finally, using a measurement tool in EVF, they learned to calculate areas of poor, medium and low growth within a field.  Other sources of satellite and aerial images (SPOT, IRS, IKONOS and Quickbird) for agricultural applications were discussed.


Participants provided the following (anonymous) feedback about this workshop:

  • Excellent.  Has peaked [sic] my interest in research applications of this technology
  • Amazing freeware.  Almost as powerful as the old ERDAS software I have used
  • Great workshop.  I appreciate the background information and all the examples
  • Good workshop, very interesting!

This WyomingView education and outreach activity was conducted by Ramesh Sivanpillai on 24 Feb 2006 as part of the annual Wyoming Agriculture Experiment Station's Research & Extension Center Planning Conference.

Friday, September 23, 2005

WCES personnel learn to display and manipulate Landsat images in ERDAS ViewFinder

Wyoming Cooperative Extension Service (WCES) personnel learned to work with remotely sensed images in ERDAS ViewFinder (EVF), a freeware image viewing and analyzing software.  WCES personnel can install EVF in their computers and do not have to periodically renew its license.  WCES personnel learned to change Landsat band combinations, obtain pixel reflectance values at specific locations, and compute areas of features such as rangelands, crop fields, and water bodies.


By displaying Landsat images in different combinations (true color, false color infrared etc.), participants learned to highlight vegetation growth in rangelands, crop growth in fields, and differences in water quality.

Some participants suggested that this 1/2 day workshop should be expanded (1- or 2-day workshop) to accommodate more examples, while others wanted to take Landsat data in a portable devices to their offices to work on problems specific to their county/region.

This WyomingView education and outreach activity was conducted by Ramesh Sivanpillai on 23 September 2005.

Tuesday, December 2, 2003

Satellite imagery can help producers identify problems early

Source: UW Extension Service's press release
By: Vicki Hamende, Writer and Editor, Office of Ag Communications and Technology
Date: 2 Dec 2003

Orbiting satellites collecting data about land surfaces can help Wyoming producers learn information like where leafy spurge infestations are on the move and whether pastures are being overgrazed or undergrazed.

Through a year-old U.S. Geological Survey-funded program called WyomingView, investigators with the Wyoming Geographic Information Science Center (WyGISC) hope to partner with the University of Wyoming Cooperative Extension Service to use mapping and spatial analysis at the grass roots level to save time and money for ranchers and farmers.  Located in newly remodeled offices in the College of Agriculture building, the center is the state’s largest repository of geospatial data used by industries, state and federal agencies, nonprofit organizations, and private citizens.

WyomingView is part of AmericaView, a program that promotes remote sensing technology, education, and research. “CES fits in on the education side,” says Kenneth Driese, principal investigator for the project. “Extension agents can make contact with individual ranchers and farmers who might be interested in improving their operations.”

The services are free to producers, who simply file a request for particular overhead images of their property and receive the records they have asked for either through their own computers or through a limited number of provided satellite dishes and computers.

Information gleaned from downloaded photographs can distinguish cured grass from new growth, monitor the necessity for fungicide treatments, test the success of variable rate nitrogen applications, determine spray drift damage, and analyze how the discharge of water from coalbed methane operations is impacting rangelands.

One farmer in North Dakota, headquarters of the Upper Midwest Aerospace Consortium of which UW is a member, was able to increase his income by $33 per acre after learning through satellite imagery that he was applying herbicides inadequately.

“The satellite can pick up plant distress caused by things like wind damage or pest attack or nutrient deficiencies long before the human eye can,” explains Ramesh Sivanpillai, coordinator of WyomingView. By studying color-coded aerial material, he says, producers can monitor their fields to spot damage before it is too late to reverse it. Driese points out that WyGISC’s direct connection to the USGS data center guarantees that producers can receive current information within a day or two of when it is requested.

Satellite image of Farson, WY
“This year we collected several images during the growing season that we gave to the Natural Resources Conservation Service to report to farmers,” Sivanpillai says. “CES can be using the same technology.”

The two scientists say College of Agriculture Dean Frank Galey and Associate Dean and CES Director Glen Whipple have expressed excitement about the opportunity. The WyomingView colleagues have also met with some CES agents and say they are eager to travel to different counties to make presentations about the services and free software they offer.

“One area we are discussing with Glen is how we can work together to train CES people and to find out what type of information they need,” Sivanpillai says. “I think this technology can help the way CES people do their jobs. They can help producers use images to do comparative analyses and pilot studies to predict yields. We hope the CES people will be able to help the end users.”

Driese says WyomingView is trying to build a UW-based consortium of data consumers in the state. “We are reaching out to federal agencies and community colleges and CES and NRCS to get the coalition growing,” he explains. “We’d like to make educational opportunities more available both at the UW level and outside the university.”

Driese says the program is also trying to add more data to the www.wygisc.uwyo.edu/wyview Web site. “For a state so sparsely populated, Wyoming is pretty far ahead of some areas in developing spatial data that farmers and ranchers can access,” Driese says. “There’s quite a lot of expertise growing on how to use it.” He notes that there are companies that provide sophisticated spectral analysis in parts of the country with more industrialized farming.

Sivanpillai says the program can help most producers in the state no matter how limited their holdings. “We’re small enough in Wyoming that they can just stop by or give us a call.”