Sunday, August 31, 2014

National Geodetic Survey plans to release future Geodetic Datums in 2022

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National Geodetic Survey (NGS) developed videos to give you a better understanding of NGS' plans to release new datums in 2022. If you use mapping products or other geo-spatial tools, these videos should also help you find out how you can prepare for the new datums. . It’s a number of years off - but the links explain the changes and provide some initial knowledge that may help you prepare for their advent…

This series of short videos, produced in collaboration between NOAA's National Geodetic Survey and The COMET Program, a part of UCAR's Community Programs, provides an introduction to geodetic datums for anyone who uses mapping products or other geo-spatial tools.

 In the first video, "What are Geodetic Datums?" (4:36), explains the basic concepts behind geodetic datums, where they are used, and why it is important to know about and use the correct datums.


Friday, August 29, 2014

Leaflet TypeError: t is null

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There are may be several reasons for TypeError:t is null, but I solved my problem by changing-
 L.marker(LATITUDE,LONGITUDE).bindPopup("Info").addTo(map);  
 to  
 L.marker(L.latLng(LATITUDE,LONGITUDE)).bindPopup("Info").addTo(map);  

Tuesday, August 26, 2014

Job Title: GIS Parcel Maintenance & Election Systems Tech

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Job Summary:
Incumbent provides general and technical support services as necessary for maintenance and support of the Scott County Geographic Information Systems (GIS). Primary responsibilities include the following for GIS: updating digital cadastral database, editing existing parcels, mapping new subdivisions and surveys, providing map production and creation of reports, maintaining spatial datasets and databases. For election systems: maintaining electronic poll books; training election officials on use of electronic poll books; preparing various items of election data for production of ballots and programming of election tabulators and voter assistance terminals.

Wednesday, August 13, 2014

Jquery Multiple Range Slider With Floating Points

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I was working on a GIS project, which required four range sliders with floating points to set LCLU change threshold. I finally find out a nice jQuery based multiple range slider at http://jsfiddle.net/q5WEe/1/   The compiled fiddle as a web page source is shown in the Part 1.

Then, my goal was to put floating points on the slider bar value display, but the native jQuery slider bar doesn't support the floating point. jQuery always roundup the floating values to the nearest integer. To display the floating point (for example,0.5 break), I multiplied the max  and values with two and divided the display value with two (Part 2) and then I got jQuery slider bar with floating value as below.





 

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