Louisiana Administrative Code › Title 43 - NATURAL RESOURCES › Part XXVII - State Lands › Subpart 1 - Land Information Mapping and Map Records System › Chapter 15 - Geographic Base Map › Section XXVII-1509 - Planimetric Mapping

Current through Register Vol. 50, No. 6, June 20, 2024
A. Planimetric
				  maps within the limits of the project area shall be prepared in conformance
				  with the map scale specified for each respective area classification required.
				  All planimetric maps shall be prepared by stereo photogrammetric methods using
				  the aerial photography, ground control and analytical aerial triangulation data
				  set forth within preceding chapters of these standards.
B. The primary planimetric features to be
				  mapped are identified on §1527, Appendix A, included herewith. Photo
				  identifiable features not specifically listed in §1527, Appendix A, shall
				  also be captured and categorized.
C. Each planimetric feature mapped will be
				  identified and stored digitally by a specific feature code as listed and
				  described within Chapter 19.
D. All
				  specified planimetric features shall be correctly identified and mapped as
				  imaged, subject to the following conditions:
1. traveled ways shall consist of curb lines
				  or edge lines which define the limits of streets, roads, avenues, parkways,
				  highways, roads, cul-de-sacs, alleys and pathways within the project area. No
				  curb line breaks shall be shown at private driveways. In areas where curb lines
				  have not been constructed, the traveled roadway or pathway edges shall be
				  shown;
2. coordinate positions for
				  all street intersections in the project area shall be determined for the center
				  of all intersections if required by the responsible contracting authority. For
				  streets containing medians (neutral grounds), coordinate positions shall be
				  determined for intersections on each side of the street (i.e., the intersection
				  of two streets with medians shall have four coordinate positions);
3. railroads shall be represented by a double
				  coded line pattern per tract line;
4. drainage canals shall be differentiated
				  between paved and unpaved;
5.
				  linear features in excess of one twenty-fifth of an inch at map scale shall be
				  mapped as a double-sided feature. All other linear features shall be mapped as
				  a single line;
6. buildings 100
				  square feet and larger shall be represented in their correct roof
				  configuration. Buildings smaller than 100 square feet in size may be mapped in
				  either their correct roof configuration or as symbols;
7. manholes and related features such as
				  catch basins, valve boxes, etc., shall be identified when possible from the
				  aerial photography depending on final map scale. The responsible contracting
				  authority may, at its discretion, elect to pre-paint selected manholes and
				  related features in order to aid in the photo interpretation and stereo
				  compilation of utility features in order to identify key locations of
				  underground lines for future network delineation;
8. larger individual trees, if required by
				  the responsible contracting authority, will be identified as photo-identifiable
				  features by size and shape.