Archuleta County CO Lineaments

This layer traces apparent topographic and air-photo lineaments in the area around Pagosa springs in Archuleta County, Colorado. It was made in order to identify possible fault and fracture systems that might be conduits for geothermal fluids. Geothermal fluids commonly utilize fault and fractures in competent rocks as conduits for fluid flow. Geothermal exploration involves finding areas of high near-surface temperature gradients, along with a suitable plumbing system that can provide the necessary permeability. Geothermal power plants can sometimes be built where temperature and flow rates are high. To do this, georeferenced topographic maps and aerial photographs were utilized in an existing GIS, using ESRI ArcMap 10.0 software. The USA_Topo_Maps and World_Imagery map layers were chosen from the GIS Server at server.arcgisonline.com, using a UTM Zone 13 NAD27 projection. This line shapefile was then constructed over that which appeared to be through-going structural lineaments in both the aerial photographs and topographic layers, taking care to avoid manmade features such as roads, fence lines, and right-of-ways. These lineaments may be displaced somewhat from their actual location, due to such factors as shadow effects with low sun angles in the aerial photographs. Note: This shape file was constructed as an aid to geothermal exploration in preparation for a site visit for field checking. We make no claims as to the existence of the lineaments, their location, orientation, and nature.

本图层勾勒出科罗拉多州阿奇莱塔县帕戈萨斯普林斯周边区域内的显性地形线性构造与航空影像线性构造（lineaments）。本数据集的制作目的为识别可能作为地热流体运移通道的断裂与裂隙系统。地热流体通常借助坚硬岩石中的断裂与裂隙作为流体运移通道。地热勘探需寻找近地表温度梯度较高的区域，同时配套具备必要渗透率的有效导水系统。当地温与流体流量较高时，可建设地热发电厂。为此，研究团队依托ESRI ArcMap 10.0软件，在现有地理信息系统（GIS）中调用了地理参考地形地图与航空影像数据。本次研究从server.arcgisonline.com的GIS服务器中选取了USA_Topo_Maps与World_Imagery图层，并采用UTM Zone 13 NAD27投影坐标系。随后，研究人员基于航空影像与地形图层中呈现的贯通性构造线性构造，绘制了本线状形状文件（shapefile），并刻意规避了道路、围栏线与通行权地带等人工设施。受航空影像中低太阳角造成的阴影效应等因素影响，本次识别的线性构造可能与实际位置存在一定偏移。注意：本形状文件仅为辅助地热勘探、为野外实地核查的现场踏勘做准备而构建。本数据集未对线性构造的存在性、位置、走向与性质作出任何断言。