{ "currentVersion": 10.61, "serviceDescription": "This is the sixth edition of the landscape integrity/disturbance layer for the state of Colorado. This layer supersedes integ_2_2015 and previous versions. Note that this is not just an update, but a refinement of both data inputs and methods. As such it should NOT be directly compared with previous versions and under no circumstances should be treated as representing \"change over time\" with previous versions. Hence the change in title from \"Landscape Integrity Layer\" to \"Landscape Disturbance Index\" (LDI). \n\nThis represents 8 individually modeled anthropogenic impacts that were then combined into a single layer. Impacts represented are: \n* Agriculture \n* Urban Development \n* Oil and Gas Development \n* Surface Mining \n* Roads \n* Utility lines (electrical transmission only) \n* Wind turbines \n* Solar installations \n\nEach individual layer has its own relevant weight and decay function type (see Supplemental Information). The individual impact layers are then additively combined to produce an overall disturbance layer. The weights are scaled to produce a final range where scores => 500 are High impact. Suggested classification of values: \n\nValue range Level of Impact \n------------------------------------------ \n0 None (or Minimal) \n> 0 - < 250 Low \n250 - < 500 Moderate \n>= 500 High \n\nThe model is based on distance decay functions for each input threat. The method of using distance decay is based on work by Tuffly and Comer (2005a and b), however the equations and parameters used are our own. We used modifications of an s-curve for the decay functions. By adjusting the shift and spread of the curve, it can be tailored to specific threats. The curve created is asymptotic at both ends, and so required post-function adjustments to make the area beyond the maximum distance = 0 and the area representing the physical footprint of the impact = the full weight. \n\nThese layers are not mutually exclusive in the threats they represent, and are in fact chosen to compliment one another so as to make up for incomplete and inaccurate source data. \n\nImpact type weight distance decay function type source * \nDevelopment - High/Medium 500 gradual LANDFIRE 1.3 & NLCD 2014 \nDevelopment - Low 300 gradual LANDFIRE 1.3 & NLCD 2014 \nAgriculture - Tilled 300 moderate-abrupt Cropscape 2015 & SWReGAP 2004 \nAgriculture - Untilled 100 moderate-abrupt Cropscape 2015 & SWReGAP 2004 \nRoads - Primary/Secondary 500 moderate TIGER/Line 2015 \nRoads - Local/Primitive 300 abrupt TIGER/Line 2015 \nOil & Gas Wells - Active 400 moderate COGCC 2016 \nOil & Gas Wells - Inactive 200 moderate/abrupt COGCC 2016 \nTransmission lines 200 moderate/abrupt Sagemap 2004 \nWind turbines 200 abrupt USGS 2015 \nSolar farms 200 abrupt USGS 2011 \nSurface Mines - Active 500 moderate CO-DRMS 2015 \nSurface Mines - Inactive 300 moderate CO-DRMS 2015 \n\n* Note that most sources were edited by CNHP to improve accuracy. \n\nWhere: \nDecay Function | Cut off Distance | Equation \nAbrupt | 250 m | (1 / (1 + Exp(((Distance / 100) - 1) * 5))) * Weight \nModerate-Abrupt | 600 m | (1 / (1 + Exp(((Distance / 100) - 2.5) * 2))) * Weight \nModerate | 1250 m | (1 / (1 + Exp((Distance / 100) - 5))) * Weight \nGradual | 2000 m | (1 / (1 + Exp(((Distance / 100) - 10) * 0.5))) * Weight \n\nTuffly, M., and P. Comer. 2005a. Calculating Landscape Integrity: A Working Model. Draft of 4/19/2005. NatureServe, Boulder, CO. Available online at: http://conserveonline.org/workspaces/human.activity.index/li_data_4_19_2005.doc \nTuffly, M., and P. Comer. 2005b. Example of landscape integrity from Puerto Rico. NatureServe, Boulder, CO. 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