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The original street centerline data was taken from the LA County CAMS dataset in March 2020. The data was heavily modified and the schema altered to conform to the standards of the Central Square CAD system. There are many other details, reference the attached excel document for field mappings and comments. o The documentation recommended the use of a planarized system to model streets and provide routability with the junctions of intersections having all incoming lines split. To ensure each line was split at a junction, we ran the planarize lines tool on the entire dataset and then proceeded to clean up all the address ranges which were split amongst many other checks. o There are many specific FeatureTypeCodes, however we used a more generic set of codes for each type of line segment. For example, main streets are A30, minor streets are A40, highways are A15, all ramps are A63, and alleys are A73. o Since all lines are planarized, we have added the elevation based on the CAD GIS requirements guide. Ramps, overpasses and non-connecting streets had the elevations changed. In general, city streets connect and had the ‘to elevation’ and ‘from elevation’ values set to 0,0. The highways are set to 1,1, with the exception being the on/off ramps and special locations with overpasses that needed elevations up to the number 4. Railroad elevations were set to 9, though with the FeatureTypeCode and speed limit being 0 it is not routable anyways.
o Based on another verbal recommendation from Randy, we went with detailed naming conventions for highways and particular freeway ramps (for example Fletcher Dr CA-2 N on ramp). o Roads in the mountains which are truck trails for brush clearance, or leading to towers were set with a speed limit of 0. We did this to prevent cases where a route can be generated from west Glendale to the North Glendale area since it would technically be shorter than traveling around the large mountain range in the mid-west portion of the City. These trail-roads were also setup with a... |
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The original street centerline data was taken from the LA County CAMS dataset in March 2020. The data was heavily modified and the schema altered to conform to the standards of the Central Square CAD system. There are many other details, reference the attached excel document for field mappings and comments. o The documentation recommended the use of a planarized system to model streets and provide routability with the junctions of intersections having all incoming lines split. To ensure each line was split at a junction, we ran the planarize lines tool on the entire dataset and then proceeded to clean up all the address ranges which were split amongst many other checks. o There are many specific FeatureTypeCodes, however we used a more generic set of codes for each type of line segment. For example, main streets are A30, minor streets are A40, highways are A15, all ramps are A63, and alleys are A73. o Since all lines are planarized, we have added the elevation based on the CAD GIS requirements guide. Ramps, overpasses and non-connecting streets had the elevations changed. In general, city streets connect and had the ‘to elevation’ and ‘from elevation’ values set to 0,0. The highways are set to 1,1, with the exception being the on/off ramps and special locations with overpasses that needed elevations up to the number 4. Railroad elevations were set to 9, though with the FeatureTypeCode and speed limit being 0 it is not routable anyways.
o Based on another verbal recommendation from Randy, we went with detailed naming conventions for highways and particular freeway ramps (for example Fletcher Dr CA-2 N on ramp). o Roads in the mountains which are truck trails for brush clearance, or leading to towers were set with a speed limit of 0. We did this to prevent cases where a route can be generated from west Glendale to the North Glendale area since it would technically be shorter than traveling around the large mountain range in the mid-west portion of the City. These trail-roads were also setup with a... |
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