Critical Lands Indicators
The following indicators make up the interactive critical lands map. Each indicator has three tiers, or levels of protection to chose from. An explanation of each of the indicators and its tiers can be found below. Referencing the indicators in the "Critical Lands Encyclopedia" may be helpful as well. |
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| Tier 1 - 30% or Greater | Tier 2 - 25% or Greater | Tier 3 -15% or Greater |
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The steep slope indicators are based on observations of standard development practices across the United States. A steep slope is generally defined as a land with a 20-25% or greater slope. Tier 1 is land with a 30% slope or greater, tier 2 is land with a 25% slope or greater, and tier 3 is land with a 15% slope or greater. A state wide slope map can be created from the Digital Elevation Models found at: ftp://ftp.agrc.state.ut.us/DEM/ |
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| Tier 1-NRCS Category 1 | Tier 2-NRCS Category 1 &4 | Tier 3-NRCS Category 1,4, & 6 |
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The prime farmland indicators are based on the Natural Resources Conservation Service’s (NRCS) prime farmland designations within the STASGO Soil Survey for Utah. Three categories of NRSC prime farmland are found in Utah: 1, 4 and 6. Several factors are used by the NRCS to designate prime farmland including; soil type, avaliable water, and erodibility. For more information refer to the technical information below. Data Source: www.ncgc.nrcs.usda.gov/products/datasets/statsgo/data/ut.html Technical Information: ftp://ftp-fc.sc.egov.usda.gov/NCGC/products/statsgo/statsgo-user-guide.pdf |
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| Tier 1 - 7-13 Species | Tier 2 - 4-13 Species | Tier 3 - 1-13 Species |
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The wildlife habitat model was created by making a species richness model using the “Utah State Sensitive Speices List” from the Utah Division of Wildlife Resources. Their habitat was determined using data from the GAP (Geographic Approach to Planning) Analysis Program of the USGS. Tier one consists of 7-13 species overlapping each other, tier two is 4-13 spieces overlapping, and tier 3 is 1-13 species overlapping. Data Source: www.gis.usu.edu/downloadabledata/UtahGAPAnalysis.html Technical Information: |
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| Tier 1 - 15 Meter Buffer | Tier 2 - 25 Meter Buffer | Tier 3 - 50 Meter Buffer |
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Stream indicators are based “braided streams” as identified by the StateAutomated Geographic Reference Center. The streams were buffered to create the different tiers. Tier 1 is a 15-meter stream buffer, Tier 2 is a 25-meter stream buffer, and Tier 3 is a 50-meter stream buffer. Data Source: ftp://ftp.agrc.state.ut.us/NAD83/Hydrology/Streams/state_wide/shape_file/SGID024/SGID024_Streams.zip |
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| Tier 1 - 15 Meter Buffer | Tier 2 - 25 Meter Buffer | Tier 3 - 50 Meter Buffer |
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Lakes indicators are based on “lakes or ponds” and “reservoirs” as identified by the State Automated Geographic Reference Center. The lakes were buffered to create the different tiers. Tier 1 is a 15-meter lake buffer, Tier 2 is a 25-meter lake buffer, and Tier 3 is a 50-meter lake buffer. Data Source: ftp://ftp.agrc.state.ut.us/NAD83/Hydrology/Lakes/state_wide/shape_file/SGID024/SGID024_Lakes.zip |
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| Tier 1 - 15 Meter Buffer | Tier 2 - 25 Meter Buffer | Tier 3 - 50 Meter Buffer |
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Wetlands indicators are based on “saturated, seasonally flooded, seasonally flooded/well-drained, seasonally flooded/saturated, semi-permanently flooded, permanently flooded, and saturated/semi-permanent/seasonal” wetlands as identified by the State Automated Geographic Reference Center. The wetlands were buffered to create the different tiers. Tier 1 is a 15-meter wetland buffer, Tier 2 is a 25-meter wetland buffer, and Tier 3 is a 50-meter wetland buffer. It should be noted that a statewide wetlands survey has not yet been completed. Data Source: ftp://ftp.agrc.state.ut.us/NAD83/Hydrology/Wetlands/state_wide/shape_file/SGID024/SGID024_Wetlands.zip |
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