Acquisition performance continues to struggle and manifest itself in the form of cost and schedule overages, and reduced DoQs
. Economic evidence, however, is starting to emerge indicating that investments in knowledge-based practices, especially TRAs as a means of achieving technology maturity, are beginning to pay off.
1) atop the DOQs was reviewed a final time, and polygons representing classes of signature variants that had not yielded BTPDs were removed.
The 2004 NAIP imagery showed 10.8% more colony signatures and 11.3% more area of colony signatures than on the 1994-97 DOQs. Adjusting colony estimates to reflect improvement in imagery, between 1,860-3,980 colonies in Texas were found with a best estimate of 3,180 colonies.
Reported colonies and historical records were utilized more than direct remote sensing work in the Trans-Pecos more so than in other ecoregions because the arid Trans-Pecos habitat resulted in high reflectance in the DOQs. The reflectance made large areas of the Trans-Pecos look like BTPD signature variants.
The examination of the results on top of 2004 NAIP imagery confirmed that some polygons removed would have remained in the dataset had the NAIP imagery been used instead of the 1994-97 DOQs. An underlying assumption was that BTPD colonies are relatively stable over a 3-5 year period.
Estimating effects of imagery.--Some BTPD signatures appearing as variants on 1994-97 DOQs appeared as puck and halo signatures on 2004 NAIP imagery.
Our objective was to develop a computer-based technique that incorporated the use of DOQs to expedite the recompilation and digitization of pre-existing soil survey information into SSURGO products.
Rectification of digital atlas field sheets to DOQs. To conduct image rectification, a transformation equation must be applied to the digital atlas field sheet.
For this process, a digital atlas field sheet and its corresponding DOQ were opened into individual IMAGINE viewers.
We evaluated the accuracy of each method by comparing the distance between selected features on the DOQ imagery and the same features on the transformed images.
This "image matching technique" is based on the principle of geo-rectifying atlas field sheets to stable DOQ base maps before soil lines are extracted.