Four vector coverages delineated by division boundaries were captured in an effort to display irrigated acreage field boundaries during the year 2000. Data captured in 1993 and provided by the state, was used as a backcoverage on top of 1-meter georectified DOQQ images, and LANDSAT 15-meter images were used where DOQQ images were not available. The 1993 data was used as a visual aid to provide an area of comparison under the assumption that the majority of fields captured in 1993 still exist in 2000
· Project set-up: Includes source material inventory and evaluation, creation of project workspaces and empty coverages, evaluation of resource requirements – personnel, equipment, and software applications – by GIS Supervisor and Project Manager. GIS Supervisor also evaluates and resolves any issues regarding projection, datum, etc. for source and final data.
· Scanning: GIS Technician scans film separates or other sources and registers and rectifies the images.
· Digitizing: GIS Technician collects and attributes features in ArcInfo using the appropriate combination of automated vectorizing and/or tracing methods and “heads-up” digitizing – as determined by project managers during set-up. GIS Tech may refer to images or hard copies of film separates and published maps as needed. GIS Supervisor provides oversight and guidance to ensure correct and accurate collection. Project Manager monitors progress and over-all project issues during this and succeeding process stages.
· Arc data quality control: QA/QC Manager with GIS background supervises quality checks on completed ArcInfo coverage(s) using combination of manual (e.g. check plot overlay on light table) and automated methods (e.g. AML applications that create frequency reports for feature attributes that are used to check completeness and consistency of attribution). GIS Supervisor provides oversight and guidance.
· Finalization: GIS Specialist restructures data so that attributes are in lookup tables and data meets data model requirements in all respects.
· Final plot creation: GIS Specialist and QA/QC Manager perform any customization to plot AML applications to fit specific requirements of each individual map, and create the required deliverable plots.
· Final report: GIS Supervisor and Project Manager create final report for each map in accordance with SOW requirements
· Quality Review: Leonard Rice Engineers, Inc. performed a review and update and finalized the coverage
The positional accuracy of 95% of nodes shall be inside a circle of radius 0.005 inch from their true positions per the source map. Also the positional accuracy of 95% of all vertices shall be inside a buffer of 0.0025 inch either side of their defining lines per the source imagery. The remaining 5% of nodes and vertices shall be within 0.010 inch in any direction from their correct positions per the source imagery.
The positional accuracy of 95% of nodes shall be inside a circle of radius 0.005 inch from their true positions per the source map. Also the positional accuracy of 95% of all vertices shall be inside a buffer of 0.0025 inch either side of their defining lines per the source imagery. The remaining 5% of nodes and vertices shall be within 0.010 inch in any direction from their correct positions per the source imagery.