Digital Climatic Atlas of Texas - Texas Water Development Board

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Appendix B Thirty year monthly means (1971-2000) of precipitation, maximum and minimum temperature, dew point temperature and mean monthly wind speed (60 data layers) were used to identify unique climatic zones of varying size across Texas. In order to identify the unique climatic zones, each climatic parameter was normalized using the maximum and minimum values of the climatic parameters to make sure that the resultant data layer was unit less. Using these 60 layers of information the Iterative Self-Organizing Data Analysis Technique (ISODATA) (Tou and Gonzalez, 1974) was used to find clusters with unique climatic properties. This clustering algorithm identifies unique patterns of temporal variations in the five climatic parameters and then assigns each pixel to a unique class iteratively until about 95% of the pixel does not change classes within subsequent iterations. The procedure was used to classify Texas into 5, 10, 25 and 50 different climatic classes. Appendix B contain illustrations of these climatic divisions along with an overlay of the NCDC’s 10 climatic division (image on the left) along with the new climatic division boundaries corrected to align with county political boundaries (image on the right) based on the dominant climatic zone of the county. It is interesting to note that the 10 climatic zones produced by ISODATA are different from the current NCDC climatic divisions, except for the High-Plains climatic division.
Note: New climatic divisions along with an overlay of the NCDC’s 10 climatic division boundary (Figure 12)
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Digital Climatic Atlas of Texas Fin
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1.0 Introduction Water resource stu
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Most of these weather stations belo
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Figure 1. Stations that measure pre
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In addition to the climatic paramet
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against which target stations (COOP
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interpolation of the missing value
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Table 2. Combination of months used
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parameters were not calculated by P
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Many evaporation models have been d
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elevation from the digital elevatio
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twelve monthly grids was calculated
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Figure 9. Difference in monthly pre
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produced using the methodology desc
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Figure 12. NCDC climatic divisions
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ich data source will be of immense
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Appendix A In the following section
Page 48: Average Monthly Maximum Temperature
Page 76: Average Monthly Lake Evaporation Ma
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Digital Climatic Atlas of Texas - Texas Water Development Board

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