Incorporating the US National Grid into Map Products

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Presentation transcript:

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 Minnesota (March 25, 2009) Military Grid Referencing System Interoperable with UTM

Grid Zone Designation (GZD) 6 x 8 Degrees

100 Km Squares

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

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

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

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

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

Scalable National Regional Local

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

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

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Critical Infrastructure Key Resources Vulnerable Population

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

Maps!

Fire Map Book

Map Index

Map 7456 (15T VK 74 56)

Street Index Dana Dr.

Map VK75 7456

Map 7456 (15T VK 74 56) 741565 (15T VK 741 565)

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

Red River Flood 100K 10K 1K

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

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

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

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()

Special Case At GZD Boundaries

USNG Field Names

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!