Does GeoMesa accept only single-band images? - geomesa

According to https://github.com/locationtech/geomesa/tree/master/geomesa-accumulo/geomesa-accumulo-raster the GeoMesa accepts only single-band images.
Therefore, in order to import to GeoMesa a colorful image I have to import (e.g.) 3 sing-band images (R, G, B)?


That bit of the documentation appears to be wrong. The tutorial here: http://www.geomesa.org/documentation/tutorials/geomesa-raster.html works through ingesting an example RGB GeoTiff using GDAL and the GeoMesa command line tools.

Related

Use JSON file in Gephi

I have a json file containing network data that I'd like to visualize using a network visualization software like Gephi. But Gephi does not accept this type of files. Is there a way to convert the json file or are there any other network visualization softwares out there that can? I am a Mac user.

You need to use networkx in Python, construct your graph and Export your graph in a format that Gephi can load such as gexfor graphml. See the link for examples of the supported formats. Apparently R is an option, too, provided that igraph has a json reader

Visjs can import Gephi JSON and display it as a graph/network:
http://visjs.org/examples/network/data/importingFromGephi.html
You probably could adapt your JSON to fit this format.

Is it possible to export geometry data from a shapefile to CSV from QGIS?

I'm trying to get geometry data from a large quantity of shapefiles into a database (Google Datastore). The thing is, I don't need to work with maps, I just need the coordinates, so I would like just the numerical coordinates. Ideally I'd like to use CSV, but any plain text would be workable. I have a Mac and have been able to get QGIS installed (I also tried udig but the interface was baffling). While it is easy to load a shp file into QGIS as a vector layer, I'm lost as to how to export the geometry, or even if it is possible.
Does anyone know how to extract plain text geometry from a shp file? Ideally with QGIS, but any method would be appreciated.

The "You can simply right-click the layer entry in QGIS and select "Save as"" approach was right
But the "GEOMETRY=AS_WKT" in the OGR layer option was missing.
I may also be a good idea to convert the coordinate system to WGS 84, as CSV are usually expected not to be projected (and shapefile sometimes are)

You can simply right-click the layer entry in QGIS and select "Save as".
In the dialog, there's an option to save as "CSV".
There are plenty of options to refine the format of the generated CSV file, as well as there are many other file formats to choose from.

Update:
See here for a solution: https://gis.stackexchange.com/a/8846
Outdated Response:
It is possible, in a sort of roundabout way...
Open the attribute table for the layer you want to save.
Select all rows.
Copy the rows
Paste into a spreadsheet
Save the spreadsheet as a csv.
Unfortunately there is no way to do this directly in QGIS.
See here for more details:
https://gis.stackexchange.com/questions/8844/get-list-of-coordinates-for-points-in-a-layer/8911#8911

How to convert geographic data to CSV

I am trying to obtain accurate site geometry for a particular location in Autodesk Revit. The site in question is located near 19621 Waters Road, Germantown MD 20874-0000. The problem is that I can only import CSV or other comma delimited text, or a CAD format, into Revit, but height data for the region at the nessisary resolution is only available from USGS mational map thingey in ArcGrid, GeoTIFF, GridFloat, and BIL_16INT formats. I am working on a computer where (because of systemadmin stuff) I can't run any unapproved executables or anything, and my home computer doesn't have Windows, only Ubuntu. Does anyone know a way to convert the data to what I need, or know of a better whay to obtain this?

If your ARC GRID is an ascii file (not binary), don't worry about .asc and just open it in Notepad.
You will find there words xllcorner, yllcorner and cellsize, and values for cell centers. Keywords xllcorner and yllcorner are coordinates of the low left corner of the grid. (And you need to know what is the coordinate system of the file and if it is the same which you want to import as csv.)
Then you can calculate (for example in Excel) the coordinates of each cell center using cellsize. And then write all this in three columns x,y,value into a text file name.csv.

I have a routine that did thins using google earth, VBA and excel... You have to install the google earth developers package but it works pretty well- grabs images off GE and coordinates it with revit VIA a CSV file.
Revit Tricks Blogspot

Best way to overlay an ESRI shapefile on google maps?

What is the best way to overlay a shapefile in Google Maps?
After some reading suggests that, converting shapefile into KML and overlaying KML in Google map is an option. If that is the case, how do I convert a shapefile into KMLs?
I believe there would be a few open source tools available for this conversion. Can anyone point to a tool to covert a shapefile to KML without any loss of data?

I like using (open source and gui friendly) Quantum GIS to convert the shapefile to kml.
Google Maps API supports only a subset of the KML standard. One limitation is file size.
To reduce your file size, you can Quantum GIS's "simplify geometries" function. This "smooths" polygons.
Then you can select your layer and do a "save as kml" on it.
If you need to process a bunch of files, the process can be batched with Quantum GIS's ogr2ogr command from osgeo4w shell.
Finally, I recommend zipping your kml (with your favorite compression program) for reduced file size and saving it as kmz.

as of 12.03.2019 FusionTables is no more...
Import the Shapefile into Google FusionTables ( http://www.google.com/fusiontables ) using http://www.shpescape.com/ and from there you can use the data in a number of ways, eg. display it using GoogleMaps.

I would not use KML. Instead, use GeoJSON which you can natively consume in Google Maps API now. It is a newer feature that didn't exist from the original responses.
In any case, simply open the SHP file in Quantum GIS, and then you can output it in any format you like (KML, GeoJSON).
If you are using Google Maps for Work, I found a premium extension that handles loading shapefiles directly where you can just connect direct to the shapefile that you generate from ESRI. I did a search on the CMaps site and found this snippet which loaded US by state shapefile: https://gmapsplugin.net/cmapsanalytics/assets/shapes/usstates.shp
var cMap = new centigon.locationIntelligence.MapView();
cMap.key([your_api_key]);
cMap.layerNames(["Basic Shapes"]);
cMap.dbfKeys([['Alabama','Alaska','Arizona','Arkansas','California','Colorado','Connecticut','Delaware','District of Columbia','Florida','Georgia','Hawaii','Idaho','Illinois','Indiana','Iowa','Kansas','Kentucky','Louisiana','Maine','Maryland','Massachusetts','Michigan','Minnesota','Mississippi','Missouri','Montana','Nebraska','Nevada','New Hampshire','New Jersey','New Mexico','New York','North Carolina','North Dakota','Ohio','Oklahoma','Oregon','Pennsylvania','Rhode Island','South Carolina','South Dakota','Tennessee','Texas','Utah','Vermont','Virginia','Washington','West Virginia','Wisconsin','Wyoming']]);
cMap.userShapeKeys([['Massachusetts','Minnesota','Montana','North Dakota','Hawaii','Idaho','Washington','Arizona','California','Colorado','Nevada','New Mexico','Oregon','Utah','Wyoming','Arkansas','Iowa','Kansas','Missouri','Nebraska','Oklahoma','South Dakota','Louisiana','Texas','Connecticut','New Hampshire','Rhode Island','Vermont','Alabama','Florida','Georgia','Mississippi','South Carolina','Illinois','Indiana','Kentucky','North Carolina','Ohio','Tennessee','Virginia','Wisconsin','West Virginia','Delaware','District of Columbia','Maryland','New Jersey','New York','Pennsylvania','Maine','Michigan','Alaska']]);
cMap.labels([['Massachusetts','Minnesota','Montana','North Dakota','Hawaii','Idaho','Washington','Arizona','California','Colorado','Nevada','New Mexico','Oregon','Utah','Wyoming','Arkansas','Iowa','Kansas','Missouri','Nebraska','Oklahoma','South Dakota','Louisiana','Texas','Connecticut','New Hampshire','Rhode Island','Vermont','Alabama','Florida','Georgia','Mississippi','South Carolina','Illinois','Indiana','Kentucky','North Carolina','Ohio','Tennessee','Virginia','Wisconsin','West Virginia','Delaware','District of Columbia','Maryland','New Jersey','New York','Pennsylvania','Maine','Michigan','Alaska']]);
cMap.polyDataSources([centigon.locationIntelligence.CMapAnalytics.DATA_PROVIDERS.SHAPE_DATAPROVIDER]);
cMap.layerTypes([centigon.mapping.Layer.TYPE.POLY]);
cMap.locations([["https://gmapsplugin.net/cmapsanalytics/assets/shapes/usstates.shp"]]);
cMap.panTo("USA");
cMap.zoomLevel(3);

Do you mean shapefile as in an Esri shapefile? Either way, you should be able to perform the conversion using ogr2ogr, which is available in the GDAL packages. You need the .shp file and ideally the corresponding .dbf file (which will provide contextual information).
Also, consider using a tool like MapShaper to reduce the complexity of your shapefiles before transforming them into KML; you'll reduce filesize substantially depending on how much detail you need.

Free "Export to KML" script for ArcGIS 9
Here is a list of available methods that someone found.
Also, it seems to me that the most efficient representation of a polygon layer is by using Google Maps API's polyline encoding, which significantly compresses lat-lng data. But getting into that format takes work: use ArcMap to export Shape as lat/lng coordinates, then convert into polylines using Google Maps API.

Just to update these answers, ESRI has included this tool, known as Layer to KML in ArcMap 10.X. Also, a Map to KML tool exists.
Simply import the desired layer (vector or raster) and choose the output location, resolution, etc. Very simple tool.

2018 already... I've found this fantastic online tool http://mapshaper.org/ to convert from ESRI shapefiles to SVG, TopoJSON, GeoJSON.
Here is the explanation of how to use it https://www.statsilk.com/maps/convert-esri-shapefile-map-geojson-format
Fast and straightforward! :)

Converting a CAD file to a shape file

Thanks for the assist on my previous question.... I was able to complete my project
This time I have a CAD file created with Autodesk that I need to convert to a shape file.
Couple of questons:
An open source application (can't afford ESRI) that can convert the CAD file to a shape file?
Is that a better file format I can use other than the shape file (shp) format?
Any suggestions would be greatly appricated
Regards
Chris

I would also suggest to use OGR but in only works with dwg/dxf version 2000 or prior; you could use Teigha (http://www.opendesign.com/) to convert the files to 2000 version and then you can use OGR.
I've done tons of conversions from dwg to shp what I usualy do is convert the dwg to a dwg version 2000 using Teigha, then convert that dwg-200 to a shape file; once a shapefile you'll see that this file contains all the layer in order to separate each layer into a different shape file I use this command
ogr2ogr new_map_from_layer_X.shp -where "LAYER = 'X'" shape_converted_from_DWG_lines.shp

You should use OGR
Link
It is the main program for converting between geographic formats. It is written in C++ but there are also python bindings. It is compiled and runs on almost every major OS.

Check out what ODA has:
http://www.opendesign.com/