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-1
votes
0answers
24 views

How to run cartodb automatically on start up

How can I start cartodb and have it on always even after server boot or shell access is closed
1
vote
1answer
63 views

Why are my points being flipped or mirrored when I convert from DMS to DD?

I have a collection of crash data that provides latitude and longitude in degrees, minutes, and seconds that I'm converting to decimal degrees using: (degrees + (minutes/60.0) + (seconds/3600.0)) ...
0
votes
1answer
230 views

Why do I get unexpected colon syntax error in Gemfile when I try to create dev user?

I run sudo sh script/create_dev_user ${SUBDOMAIN} and then I receive the following error: Gemfile syntax error compile error on line 9: syntax error, unexpected ':', expecting $end gem 'sequel_pg', ...
1
vote
0answers
81 views

Building a road path using openlayers and shapefiles? [closed]

I'm looking to learn OSM and Openlayers. From what I can tell, I need OpenLayers to display the map on a website and I need shapefiles to do any manipulation on the map regarding its topographical ...
0
votes
0answers
153 views

error occured when importing file on cartodb local host

Logged in as development user. Not able to import a .zip or a csv file. Ruby console has this error log 1.9.2p320 :004 > DataImport[1].log 2014-01-07T05:44:44Z || Using database connection with ...
1
vote
0answers
100 views

Geocode incredibly quickly but inaccurately

I have a Rails 4 app that needs to be able to geocode a large number of places very quickly, but not with any high degree of accuracy. Accurate to a few miles would be fine, I really just need the ...
1
vote
1answer
55 views

Communicate synchronously & continuously (coords, etc) from terminal to application-based mapping software such that updates are displayed live on map

I run a lot of spatial queries. Hundreds of thousands a week. While these things are running, it would be nice if I could see what (where, actually) my scripts are working with. Distance calculations, ...
3
votes
1answer
169 views

intersection between two multipolygons yielding anomalous GeometryCollection object full of LineString's & Polygon's (trying to get intersect area)

Normally when I call the #intersection method on a multipolygon to find the intersection shape on another multipolygon I get a multipolygon returned back to me. Either that or something else I can ...
1
vote
2answers
1k views

Attempting to use ST_DWithin to locate objects within a given distance of meters using SRID 4326

I'm a Rails developer with minimal GIS experience, working with PostGIS and the RGeo gem. I'd like to find all of the cows within 500 meters of my current location. So, I'll create a model for my ...
0
votes
1answer
622 views

How to fix “Connection failed - Check settings and try again” when connecting to PostGIS?

I have Postgres running via Postgres.app on rails already and am trying to connect QGis to the database. PostGIS is working already. (questions already found online deal with this issue only) I do ...
3
votes
1answer
437 views

When trying to convert lon/lat (curved) coordinates to projected (flat) coordinates with ruby, the second (y axis) projected coords are inaccurate

So I have created a polygon using Google Earth pro. I've exported it into a kml file, which I can then parse using ruby's XML/HTTP-parsing Nokogiri gem into an array of WKT points (LinearRing) thats ...
2
votes
1answer
118 views

Which fields are standardized to describe a ShapeFiles feature?

I would like to store data into a database which is available here either as JSON or as ShapeFiles. The JSON looks something like this: { "type": "FeatureCollection", "features": [ { ...
8
votes
1answer
1k views

Pros and cons of using Ruby/Rails/RGeo or Python/GeoDjango for a web based GIS

We're at the investigation phase of creating a web based GIS. We're assessing options for an ORM to use in all of our backend import/export and processing routines. From my research, GeoDjango appears ...
1
vote
0answers
301 views

Can I use RGeo::Point data in PostGIS queries without multiple conversion?

How can I represent RGeo::Point ( CAPI implementation ) in some way where I don't have to convert it once more in Sql? Now I have something like this: class Poly scope :enclosing ->(geom) do ...
1
vote
1answer
300 views

Point plus distance along great circle using RGeo or WKT

I'm racking my brains (and google) trying to figure out how to get RGeo to do the following geospatial calculation: Imagine I start off at some arbitrary geographic point (let's say (45, 45) which ...
1
vote
2answers
98 views

Offline data and less space with Ruby

I have a very specific problem. I am trying to build an offline map on leaflet, rhomobile(based on ruby) and OSM data. The problem is that I am making now a offline layer images folder with the city ...
3
votes
4answers
759 views

Algorithm for finding population for a given center point and radius in US

Here is what I have The population data aggregated by zip code given by US Census. Here is what I am doing right now: Reverse geo code the center point to find the zip code of the center point. ...
11
votes
9answers
2k views

What are the advantages of using Rails for a GIS/mapping application?

I've heard some good things about Rails, but I don't know much about it yet. There are only a few questions about Rails on GIS.SE (and there's not even a Rails tag). Is it worthwhile to learn about ...