Free geographic software for linux

OGDI is the Open Geographic Datastore Interface. OGDI is an application programming interface (API) that uses a standardized access methods to work in conjunction with GIS software packages (the application) and various geospatial data products.
OGDI uses a client/server architecture to facilitate the dissemination of geospatial data products over any TCP/IP network, and a driver-oriented approach to facilitate access to several geospatial data products/formats.
Enhancements:
- This release fixes some significant bugs in the VRF (VPF) driver.

AML Cartography provides AML and C code and documentation for cartography within the ARC/INFO geographic information system.

The ARC Macro Language and C programs discussed in this guideline are available by anonymous ftp from sdcdg01.sdc.epa.gov and are in the files:

/pub/readme.cart
/pub/map_amls.tar.Z
/pub/map_design.tar.Z
/pub/map_post.Z
/pub/color_post.tar.Z
/pub/baw_post.tar.Z

Geo::Distance is a Perl module that can calculate distances and closest locations.

SYNOPSIS

use Geo::Distance;
my $geo = new Geo::Distance;
$geo->formula(hsin);
$geo->reg_unit( toad_hop, 200120 );
$geo->reg_unit( frog_hop => 6 => toad_hop );
my $distance = $geo->distance( unit_type, $lon1,$lat1 => $lon2,$lat2 );
my $locations = $geo->closest(
dbh => $dbh,
table => $table,
lon => $lon,
lat => $lat,
unit => $unit_type,
distance => $dist_in_unit
);

This perl library aims to provide as many tools to make it as simple as possible to calculate distances between geographic points, and anything that can be derived from that. Currently there is support for finding the closest locations within a specified distance, to find the closest number of points to a specified point, and to do basic point-to-point distance calculations.

METHODS

new

my $geo = new Geo::Distance;
my $geo = new Geo::Distance( no_units=>1 );

Returns a blessed Geo::Distance object. The new constructor accepts one optional argument.

no_units - Whether or not to load the default units. Defaults to 0 (false).
kilometer, kilometre, meter, metre, centimeter, centimetre, millimeter,
millimetre, yard, foot, inch, light second, mile, nautical mile,
poppy seed, barleycorn, rod, pole, perch, chain, furlong, league,
fathom

formula

if($geo->formula eq hsin){ ... }
$geo->formula(cos);

Allows you to retrieve and set the formula that is currently being used to calculate distances. The availabel formulas are hsin, polar, cos, and mt. hsin is the default and mt/cos are depreciated in favor of hsin. polar should be used when calculating coordinates near the poles.

reg_unit
$geo->reg_unit( $radius, $key );
$geo->reg_unit( $key1 => $key2 );
$geo->reg_unit( $count1, $key1 => $key2 );
$geo->reg_unit( $key1 => $count2, $key2 );
$geo->reg_unit( $count1, $key1 => $count2, $key2 );

This method is used to create custom unit types. There are several ways of calling it, depending on if you are defining the unit from scratch, or if you are basing it off of an existing unit (such as saying 12 inches = 1 foot ). When defining a unit from scratch you pass the name and rho (radius of the earth in that unit) value.

So, if you wanted to do your calculations in human adult steps you would have to have an average human adult walk from the crust of the earth to the core (ignore the fact that this is impossible). So, assuming we did this and we came up with 43,200 steps, youd do something like the following.

# Define adult step unit.
$geo->reg_unit( 43200, adult step );
# This can be read as "It takes 43,200 adult_steps to walk the radius of the earth".

Now, if you also wanted to do distances in baby steps you might think "well, now I gotta get a baby to walk to the center of the earth". But, you dont have to! If you do some research youll find (no research was actually conducted) that there are, on average, 4.7 baby steps in each adult step.

# Define baby step unit.
$geo->reg_unit( 4.7, baby step => adult step );
# This can be read as "4.7 baby steps is the same as one adult step".

And if we were doing this in reverse and already had the baby step unit but not the adult step, you would still use the exact same syntax as above.
distance

my $distance = $geo->distance( unit_type, $lon1,$lat1 => $lon2,$lat2 );

Calculates the distance between two lon/lat points.
closest

my $locations = $geo->closest(
dbh => $dbh,
table => $table,
lon => $lon,
lat => $lat,
unit => $unit_type,
distance => $dist_in_unit
);

This method finds the closest locations within a certain distance and returns an array reference with a hash for each location matched.

The closest method requires the following arguments:

dbh - a DBI database handle
table - a table within dbh that contains the locations to search
lon - the longitude of the center point
lat - the latitude of the center point
unit - the unit of measurement to use, such as "meter"
distance - the distance, in units, from the center point to find locations

The following arguments are optional:

lon_field - the name of the field in the table that contains the longitude, defaults to "lon"
lat_field - the name of the field in the table that contains the latitude, defaults to "lat"
fields - an array reference of extra field names that you would like returned with each location
where - additional rules for the where clause of the sql
bind - an array reference of bind variables to go with the placeholders in where
sort - whether to sort the locations by their distance, making the closest location the first returned
count - return at most these number of locations (implies sort => 1)

This method uses some very simplistic calculations to SQL select out of the dbh. This means that the SQL should work fine on almost any database (only tested on MySQL and SQLite so far) and this also means that it is fast. Once this sub set of locations has been retrieved then more precise calculations are made to narrow down the result set. Remember, though, that the farther out your distance is, and the more locations in the table, the slower your searches will be.

Number::Phone::IE is a Perl module with Republic of Ireland-specific methods for Number::Phone.
SYNOPSIS
use Number::Phone;
$dermots_phone = Number::Phone->new(IE, 017654321);
METHODS
The following methods from Number::Phone are overridden:
is_valid
The number is valid within the national numbering scheme. It may or may not yet be allocated, or it may be reserved. Any number which returns true for any of the following methods will also be valid.
is_allocated
The number has been allocated to a telco for use. It may or may not yet be in use or may be reserved. Not currently implemented.
is_geographic
The number refers to a geographic area.
is_fixed_line
The number, when in use, can only refer to a fixed line.
is_mobile
The number, when in use, can only refer to a mobile phone.
is_pager
The number, when in use, can only refer to a pager.
is_tollfree
Callers will not be charged for calls to this number under normal circumstances.
is_specialrate
The number, when in use, attracts special rates. For instance, national dialling at local rates, or premium rates for services.
is_adult
The number, when in use, goes to a service of an adult nature, such as porn.
is_network_service
The number is some kind of network service such as a human operator, directory enquiries, emergency services etc
country_code
Returns 353.
regulator
Returns some text in an appropriate character set saying who the telecoms regulator is, with optional details such as their web site or phone number.
areacode
Return the area code - if applicable - for the number. If not applicable, returns undef.
areaname
Return the area name - if applicable - for the number, or undef.
subscriber
Return the subscriber part of the number
operator
Return the name of the telco operating this number, in an appropriate character set and with optional details such as their web site or phone number. Not currently implemented.
format
Return a sanely formatted version of the number, complete with IDD code, eg for the Irish number (021) 765-4321 it would return +353 21 7654321.
country
If the number is_international, return the two-letter ISO country code.
NYI
Version restrictions:
- Strictly sppeaking, this kind of duplication of the Number::Phone::UK class is bad. A tidy-up is in order, though it may emerge that a completely new implemantation is better.
- The results are only as accurate as my own investigations into current allocations. User feedback welcome.
- While the names of the nominal owners of mobile prefixes are given, number portability makes this information unreliable.

GeoQO project is a geographical waypoint management software set that lets you manage your geocaches and other types of geographical data.
- geoqo: The command line interface to your data
(this is likely what most people need).
- GeoDB: The perl module interface which geoqo is built on top of.
(Programmers may wish to use these modules too).
Note/Warning: This is a work in progress. There are many more features than are currently documented (Im working on it; be patient). If you have questions, stop by the #geocache IRC chat room and Id be happy to answer questions. Or even better, write the mailing list and I or someone else will help you.
Enhancements:
- Geocaches can be rated and ratings can be sent to and retrieved from a rating server.
- Perl can be directly embedded within scripts.
- The top10 module can do averages as well as call scripts on each result.
- Improved GUI support.
- Other miscellaneous improvements and changes.

Geo::Inverse is a Perl module to calculate geographic distance from a lat & lon pair.

SYNOPSIS

use Geo::Inverse;
my $obj = Geo::Inverse->new(); # default "WGS84"
my ($lat1,$lon1,$lat2,$lon2)=(38.87, -77.05, 38.95, -77.23);
my ($faz, $baz, $dist)=$obj->inverse($lat1,$lon1,$lat2,$lon2); #array context
my $dist=$obj->inverse($lat1,$lon1,$lat2,$lon2); #scalar context
print "Input Lat: $lat1 Lon: $lon1n";
print "Input Lat: $lat2 Lon: $lon2n";
print "Output Distance: $distn";
print "Output Forward Azimuth: $fazn";
print "Output Back Azimuth: $bazn";

This module is a pure Perl port of the NGS program in the public domain "inverse" by Robert (Sid) Safford and Stephen J. Frakes.

CONSTRUCTOR

new

The new() constructor may be called with any parameter that is appropriate to the ellipsoid method which establishes the ellipsoid.

my $obj = Geo::Inverse->new(); # default "WGS84"

METHODS

ellipsoid

Method to set or retrieve the current ellipsoid object. The ellipsoid is a Geo::Ellipsoids object.

my $ellipsoid=$obj->ellipsoid; #Default is WGS84

$obj->ellipsoid(Clarke 1866); #Built in ellipsoids from Geo::Ellipsoids
$obj->ellipsoid({a=>1}); #Custom Sphere 1 unit radius
inverse

This method is the user frontend to the mathematics. This interface will not change in future versions.

my ($faz, $baz, $dist)=$obj->inverse($lat1,$lon1,$lat2,$lon2);

GeoVISTA Studio is an open software development environment designed for geospatial data. GeoVistaStudio is a programming-free environment that allows users to quickly build applications for geocomputation and geographic visualization.
One barrier to the uptake of Geocomputation and Geovisualization is there is no system or toolbox that provides easy access to useful functionality. GeoVISTA Studio provides rapid, programming free development of complex applications for:
- data exploration
- knowledge construction
- geocomputation
- visualization
Studio Includes Interactive Query Devices for Exploratory GeoVisualization, 3D Render for complex and sophisticated 3D graphics, 2D mapping and statistical tools.
Studio provides a:
1. Visual Programming-Free Environment for rapid development.
2. Component-Oriented Programming: uses JavaBeans as programming components. Any JavaBeans (developed by 3rd parties) can be plugged in!
3. Recursive Development turns a developed application into a JavaBean component. Developed components (applications) are reusable (scalable), and developed components can be shared by other Studio users and/or java programmers.

Mapnik is an OpenSource C++/Python toolkit for developing GIS (Geographic Information Systems) applications. At the core is a C++ shared library providing algorithms/patterns for spatial data access and visualization.
Essentially a collection of geographic objects (map, layer, datasource, feature, geometry), the library doesnt rely on "windowing systems" and can be deployed in any server environment. It is intended to play fair in a multi-threaded environment and is aimed primarily, but not exclusively, at web-based development.
High-level Python bindings (boost.python) facilitate rapid application development, targeting zope3, django etc.
Main features:
- extensible datasource plug-in architecture (ESRI shape files, PostgreSQL/PostGIS)
- anti-aliasing rendering
- expressions based styling
Enhancements:
- Major feature enhancements were made as well as a bugfixes.
- The new features include projection transformations, multiple named styles in WMS, line following text labels, a shield symbolizer, feature querying, character encoding support, GetFeatureInfo with text/plain and text/xml output, and support for right to left languages.