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Incorporating the US National Grid into Map Products

Incorporating the US National Grid into Map Products. Randy Knippel Dakota County. United States National Grid (USNG). National standard since 2001 Adopted by federal agencies FEMA, DHS, NGA, USGS Adopted by several states Florida, Missouri, North Carolina, others

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Incorporating the US National Grid into Map Products

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  1. Incorporating the US National Grid into Map Products Randy Knippel Dakota County

  2. United States National Grid(USNG) • National standard since 2001 • Adopted by federal agencies • FEMA, DHS, NGA, USGS • Adopted by several states • Florida, Missouri, North Carolina, others • Minnesota (March 25, 2009) • Military Grid Referencing System • Interoperable with UTM

  3. Grid Zone Designation (GZD) 6 x 8 Degrees

  4. 100 Km Squares

  5. 10 Km Squares USNG:15T VK 75 UTM: Zone 15 N 470,000 E 4,950,000 N

  6. 1 Km Squares USNG:15T VK 7857 UTM: Zone 15 N 478,000 E 4,957,000 N

  7. Why? • Multiple grids • Needed one for everyone • Need efficient location referencing • Need interoperability • Across jurisdictions • Local, state, federal, military

  8. What about Lat / Long? • Not intuitive • Degrees, minutes, seconds • Several formats • DMS, DMS.sss, DM.mmm, D.ddd • Longitude • + / - • West / east • Increases right to left

  9. What about Lat / Long? • How big is a degree? • It varies • 69 miles at the equator • Longitude gets smaller toward poles • 50 miles in Dakota County • Distance calculations are difficult

  10. Scalable National Regional Local

  11. Precision and Truncation • 18SUJ2337106519 • 18S UJ 23371 06519 • 1 meter precision, full USNG designation • UJ2306 • Assume GZD (18S) • UJ – 100,000 m precision (100 km square) • 23 06 – 1000 m precision (1 km square) • 2337 0651 • 10 m precision • Assume GZD and 100 km square

  12. Truncating GZD • USNG:15T VK (100Km square) • VK is unique for 800 miles in any direction

  13. `

  14. Critical Infrastructure Key Resources Vulnerable Population

  15. GIS For Emergency Management • Status • Resource deployment • Damage assessment Recovery Response Mitigation Preparation • Analysis • Planning

  16. Maps!

  17. Fire Map Book

  18. Map Index

  19. Map7456(15T VK 74 56)

  20. Street Index Dana Dr.

  21. MapVK75 7456

  22. Map7456(15T VK 74 56) 741565(15T VK 741 565)

  23. Deployment • Maps and map books on the web • Printed maps and map books • Strategic distribution • Train the trainer • Training • Dispatch

  24. Red River Flood 100K 10K 1K

  25. Statewide Effort • Create 10K maps for entire state • FGDC CAP grant • Structures & data stewardship • Engage locals to verify data • Develop data, templates, procedures • File naming convention

  26. Merge PDF’s • For each USNG pdf file in the overlay directory: • Find the corresponding USNG pdf file in the basemap directory • Merge the overlay pdf and legend pdf file into the basemap pdf • Write the output pdf to a new directory using a date / time stamp

  27. Merge PDF’s • Adobe Acrobat – Standard Edition • Watermark (with transparency!) • Adobe Acrobat – Pro Edition • Scripting • Python Scripting • PyPDF • Batch processing • Others…

  28. Python Script Using PyPDF from pyPdf import PdfFileWriter, PdfFileReader output = PdfFileWriter() basemap = PdfFileReader(file("basemap\15TVK85.pdf", "rb")) overlay = PdfFileReader(file("event1\15TVK85.pdf", "rb")) legend = PdfFileReader(file("event1\legend.pdf", "rb")) result = input1.getPage(0) result.mergePage(overlay.getPage(0)) result.mergePage(legend.getPage(0)) output.addPage(result) output.write(file("200912081322\15TVK85.pdf", "wb")) outputStream.close()

  29. Special Case At GZD Boundaries

  30. USNG Field Names

  31. We Need Your Help! • Study USNG standard and materials • Provide peer review • USNG data • Field names • Template MXD’s • 10K maps • Develop standard procedures & scripts • Sell it!

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