Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>GIV Version 2.3 provides an estimate of the economic benefits of the Chicago Wilderness Green Infrastructure Vision that can be reliably estimated. This grid represents the combined economic value in 2014 dollars/pixel/year of four ecosystem services: Water Flow Regulation / Flood Control, Water Purification, Groundwater Recharge, and Carbon Storage as well as the relative value of one ecosystem service: Flora/Fauna. See the final report for additional methodological details.</SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>In 2004, the Northeastern Illinois Planning Commission completed a Green Infrastructure Vision (GIV) for the Chicago area. GIV 1.0 identified Recommended Resource Protection Areas (RPAs) in the region and protection approaches for each. The next version, GIV 2, undertaken by The Conservation Fund and Applied Ecological Services (AES), was a refinement of the RPAs that classify and characterize important resources in a consistent and scientifically defensible manner, define ecological and human connectivity needs, and better inform conservation and development planning and decision making. </SPAN></P><P><SPAN>This dataset combines all landscape types identified by GIV 2.2 into a single grid. See metadata for individual grids for additional information. The Core Landscapes layer symbolizes the grid to display only Core Landscape Types and Core Designated Areas.</SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN><SPAN>The GIV 2.2 is the foundation for developing the relative value of native flora and fauna provided by the GIV in the CMAP region. Using ArcGIS for Desktop 10.2.2 we built GIS models within the Model Builder environment. Designated habitat confirmed as important for biodiversity was given the highest value. Other core areas within the GIV were given importance but not as high as areas with confirmed high ecological value. Each cell was assigned a value according to landscape type. The GIV layers were mosaicked into one raster layer and always preserving the maximum value assigned to each cell when there was any overlap between the layers. The relative values range from 2-10 with 10 being the highest and 2 the lowest. </SPAN></SPAN></P></DIV></DIV>
Name: Carbon Storage: Aboveground and Soil Organic Carbon
Display Field:
Type: Raster Layer
Geometry Type: null
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P STYLE="text-align:Justify;margin:0 0 0 0;"><SPAN>Carbon storage was calculated using two datasets in order to estimate above ground and below ground standing carbon stock. The first one is The National Biomass and Carbon Dataset 2000 (NBCD 2000). A high spatial resolution (30 m), year-2000 baseline estimate of basal area-weighted canopy height, aboveground live dry biomass, and standing carbon stock for the conterminous (lower 48) United States. One 16-bit signed raster layer at 30 m resolution. Digital numbers represent the amount of aboveground live dry biomass present in kg/m2 * 10. Thus, aboveground live dry biomass in kg/m2 = <Digital Number> / 10. Values were multiplied by 10 to preserve significant figures yet reduce file size. Units of kg/m2 were selected to coincide with FIA results/methodology. The units were converted to metric tons (tonnes) per hectare. To estimate the number of metric tonnes of biomass in a given region of interest/polygon, sum the values that NBCD2000 Mapping Zone lie within the polygon of interest and then multiply the result by 0.09 (which accounts for the fractional portion of a hectare present in a single 30 meter pixel).</SPAN></P><P STYLE="margin:0 0 0 0;"><SPAN /></P><P STYLE="margin:0 0 0 0;"><SPAN>The second dataset is the Gridded SSURGO (gSSURGO), similar to the standard product from the United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Soil Survey Geographic (SSURGO) Database, but is in the Environmental Systems Research Institute, Inc. (ESRI®) file geodatabase format. The National Value Added Look Up (valu) Table database is designed to facilitate thematic mapping for several important soil properties and interpretations. The valu1 table within this database is a compilation of 57 pre-summarized or "ready to map" attributes derived from the soil survey geographic database, including soil organic carbon. The map unit average soil organic carbon values are given in units of grams carbon per square meter for 11 standard layer or zone depths. We used the entire soil depth. We converted both data sets to the same units and added them using Raster Calculator. To calculate the dollar value of carbon storage per grid cell = (Cabove + Cbelow) * $2/tonne/year.</SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN><SPAN>The GIV 2.2 is the foundation for developing the approximate value of groundwater recharge services provided by the GIV in the CMAP region. Using ArcGIS for Desktop 10.2.2 we built GIS models within the Model Builder environment. The resulting valuation from literature review and expert opinion was spatially explicit and the values were transferred to the GIV layers using raster analysis (cell size = 30m x 30m). Each cell was assigned a dollar value according to landscape type. The GIV layers were mosaicked into one raster layer and always preserving the maximum value assigned to each cell when there was any overlap between the layers. Having a dollar value for each cell allowed us to calculate the total value in dollars provided by the GIV for groundwater recharge. Values ranged from $269 acre/year - $4,806 acre/year. </SPAN></SPAN></P></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><P><SPAN>The GIV 2.2 is the foundation for developing the approximate value of water flow regulation and flood control services provided by the GIV in the CMAP region. Using ArcGIS for Desktop 10.2.2 we built GIS models within the Model Builder environment. The resulting valuation from literature review and expert opinion was spatially explicit and transferred to the GIV layers using raster analysis (cell size = 30mX30m). Each cell was assigned a dollar value according to landscape type. The GIV layers were mosaicked into one raster layer and always preserving the maximum value assigned to each cell when there was any overlap between the layers. Having a dollar value for each cell allowed us to calculate the total value in dollars provided by the GIV for water flow regulation and flood control. Values range from $1,603/acre/year - $37,000 acre/year.</SPAN></P></DIV>