20250818 03383300 1.0 TRUE CreateMosaicDataset \\amznfsxghqcfqsg.mdgov.maryland.gov\share\gis_imagery_data\ImageServices\Historical\MD_USGS_15MQuad.gdb MD_USGS_15MQuad PROJCS["WGS_1984_Web_Mercator_Auxiliary_Sphere",GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137.0,298.257223563]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Mercator_Auxiliary_Sphere"],PARAMETER["False_Easting",0.0],PARAMETER["False_Northing",0.0],PARAMETER["Central_Meridian",0.0],PARAMETER["Standard_Parallel_1",0.0],PARAMETER["Auxiliary_Sphere_Type",0.0],UNIT["Meter",1.0]] # # NONE # AddRastersToMosaicDataset \\amznfsxghqcfqsg.mdgov.maryland.gov\share\gis_imagery_data\ImageServices\Historical\MD_USGS_15MQuad.gdb\MD_USGS_15MQuad "Raster Dataset" '\\amznfsxghqcfqsg.mdgov.maryland.gov\share\gis_imagery_data\ImageServicePublishing\PublishImageServices\doit-imap-imagery-prod.acs\CloudOptimizedImages\MDOT_SHA_Historical\USGS 15 Quadrangles\SHA\USGS_15M_Quad_MD\USGS_15_min_Quad.tif' UPDATE_CELL_SIZES UPDATE_BOUNDARY NO_OVERVIEWS # 0 1500 # # SUBFOLDERS ALLOW_DUPLICATES NO_PYRAMIDS NO_STATISTICS NO_THUMBNAILS # NO_FORCE_SPATIAL_REFERENCE NO_STATISTICS # NO_PIXEL_CACHE C:\Users\aa.john.shiu\AppData\Local\ESRI\rasterproxies\MD_USGS_15MQuad 150000000 5000 ItemDescription Maryland Historical USGS 15 Minute Quad Layer from between 1892 and 1930. <div style='text-align:Left;'><div><div><p><span>This layer is a mosaic of historical topographic maps retrieved online from USGS topoView (https://ngmdb.usgs.gov/topoview/). 63k scale range topographic maps with a 15-minute range were downloaded to cover the state of Maryland, where available. Maps selected for this mosaic were compared visually to find the oldest edition of best visual quality. The mosaic contains maps with edition years dating between 1892 and 1930. If necessary, a later map edition was used if the oldest edition did not match visual quality of the surrounding quadrants. The map collar containing the legend, scales, grid information, declination data, etc. was removed using the clipping tool to enable a seamless appearance between each quadrangle. ESRI ArcGIS Pro was used to clip and generate a statewide mosaic.</span></p></div></div></div> MD iMAP, MDOT SHA, USGS MD_USGS_15MQuad MD MDOT SHA USGS topoView 15 Minute Quad Historical Topographic Map Collection HTMC Georeference Topographic <div style='text-align:Left;'><div><div><p><span>The Spatial Data, and the information therein, (collectively the "Data") is provided "as is" without warranty of any kind, either expressed, implied, or statutory. The user assumes the entire risk as to quality and performance of the Data. No guarantee of accuracy is granted, nor is any responsibility for reliance thereon assumed. In no event shall the State of Maryland be liable for direct, indirect, incidental, consequential or special damages of any kind. The State of Maryland does not accept liability for any damages or misrepresentation caused by inaccuracies in the Data or as a result to changes to the Data, nor is there responsibility assumed to maintain the Data in any manner or form. The Data can be freely distributed as long as the metadata entry is not modified or deleted. Any data derived from the Data must acknowledge the State of Maryland in the metadata.</span></p></div></div></div> 20260803