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

Universal Citation: LA Admin Code XXVII-1509

Current through Register Vol. 50, No. 9, September 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.

E. Photo-identifiable features are defined as those features which are clearly definable in location from the aerial photography and/or which may be identified in the list of feature elements included within Chapter 19. Any features when identifiable which are not included within the list of feature elements shall be defined by appropriate outline, symbol and/or annotation by using feature code additions to the data aggregation.

AUTHORITY NOTE: Promulgated in accordance with R.S. 50:171.

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