#shapefiles

[fyeahgeographyalligator]

Posted without comment.

(From @/pokateo_maps on Twitter)

[pinnacle-cart]

Download GIS Shapefiles - FSA, GNIS, zip code, climate, tornadoes, school districts, zip codes, dams , Indian and federal lands, toxic releases - User Reviews

Download GIS Shapefiles – FSA, GNIS, zip code, climate, tornadoes, school districts, zip codes, dams , Indian and federal lands, toxic releases – User Reviews

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[ijtsrd]

A Spatio-Temporal Model for Massive Analysis of Shapefiles

By Dr. Prabha Shreeraj Nair"A Spatio-Temporal Model for Massive Analysis of Shapefiles"

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-1 , December 2017,

URL: http://www.ijtsrd.com/papers/ijtsrd6994.pdf

http://www.ijtsrd.com/engineering/biological-and-bio-system-engineering/6994/a-spatio-temporal-model-for-massive-analysis-of-shapefiles/dr-prabha-shreeraj-nair

international journal of science, special issue publication, management journal

Over the course of time an organization working with geospatial data accumulates tons of data both in the form of vector and raster formats. This data is a result of co-ordinated processes within the organization and external sources such as other collaborative organizations, projects and agencies, crowd sourcing efforts, etc. The massive amount of data accumulated as a result and the recent developments in the distributed processing of geo-data have catalyzed the development of our spatio-temporal data processing model. Our model is loosely based upon GS-Hadoop and uses dataset consisting of more than 300,000 shapefiles (a vector data format), which was accumulated over a span of several years from various sources and creation of custom geo-portals for government departments. The developed model provides access to visual representation, extraction of features and related attributes from over more than 800 GB of shapefile data containing ten of billions of features. In this paper, we model a spatial data infrastructure for processing such huge amount of geo-data.

[pixienatthecat]

[chicagoportalstatus]

What coordinate system do our shapefiles use?

We frequently get questions about what coordinate system our shapefile datasets use.  The answer is State Plane Illinois East NAD 1983.

It is important to note that this answer applies to the files we upload -- those of view type Files and Documents and “Original” exports of our newer map format.  The “Shapefile” exports are created by the Data Portal software, even if the original file was also a shapefile, and use WGS84.

[paulbradshaw]

Online mapping for beginners - YouTube)

[the-last-supercontinent-blog]

I hope really, really, really great things

happen all day to the delightful individual who just sent me the shapefiles I needed but couldn't access on a website (THE ONLY WEBSITE THAT HAD THEM) because of broken links.

PRAISE THE LORD.

[jrlittle]

ARCgis - how to save a selected shapefile

Get shapefile from ESRI, in my case from here

Open the Shapefile:  File > Add Data > Add Data

Limit the data to your selection:  Selection > Select by Attributes > choose a method (e.g. dbl-click “STCOFIPS) > click ‘=’ button > click “Get Unique Values” button and dbl-click value (e.g. ‘37063’) > OK

Pan to selected features (optional):  right-click on layer > selection > Zoom to Selected Feature

Save selected data: right-click layer > Data > Export Data > (selected features is selected by default) right-click the folder to choose a location > Save as type = ‘shapefile’ > right-click ‘+-folder’ to put it somewhere (check "look in" section) > Save > OK >  ‘yes’ to add the selected shape as a layer

Optional: right-click to remove unneeded layer

exit

Fix the Projection (too) (assumes you skipped step 7 above)

View > Data Frame Properties > Projected Coordinate System > State Plane > NAD 1983 (US Feet) > (choose the appropriate selection, closest to the selection from above) > OK > Yes

Then do a join, but you may need to massage a number-to-text field conversion as noted here.