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Klencke Atlas Online
By Lurker,
The Klencke Atlas is one of the world's biggest: it measures 176 x 231 cm when open.
It takes its name from Joannes Klencke, who presented it to Charles II on his restoration to the British thrones in 1660. Its size and its 40 or so large wall maps from the Golden Age of Dutch mapmaking were supposed to suggest that it contained all the knowledge in the world.
At another level, it was a bribe intended to spur the King into granting Klencke and his associates trading privileges and ti
bind layers from database or add new layer(s) to existing layers
By Farzaneh,
First of all, I have to say that I'm new to the OpenLayers. I was used OpenLayers 4 in this project.
We have a map with group layers that can visible or invisible any of them.
var map = new ol.Map({
controls: ol.control.defaults().extend([
new ol.control.FullScreen()
]),
layers: [
new ol.layer.Tile({
source: new ol.source.OSM()
}), new ol.layer.Group({
layers: [
new ol.layer.Til
Help on reading coordinate numbers
By nexaen,
Hello,
I've received following PDF map and text note consisting coordinate numbers to get dimensions of blue hachured areas (tunnels) on the map. Do you know what coordinate system is it? or if you can share some links with me regarding this format?
At first I thought numbers are based on UTM coordinate system, but the PDF map doesn't have any scale on top-&left sides or others sides. So, I cannot read numbers based on that.
Any help would be appreciated.
PDF+text
Invitation for GIS Software Technology Conference 2017
By seanpierrce,
Dear Sir/Madam,
On 24th-25th, August, 2017, GIS Technology Conference 2017 will be held in China National Convention Center, Beijing, China. The conference is themed as 'Geo-intelligence, Driven by Data’, focusing on the technological development and revolution of GIS software, exploring advanced technology applications on various industries.
It is estimated over 3,000 industrial leaders, government officials, experts, colleagues, users and researchers would participate in this confere
Calculate direction / angle between polar coordinates
By sAnSiBaR,
Hi folks,
I think there would be a simple geodetic solution for my question, but let's see:
I want to get the direction like on a compass between 0° and 360° between two polar coordinates.
How does this work?
for example:
r_1 = 4.47 theta_1 = 63.4
r_2 = 6.32 theta_2 = 71.6
For the result it does not matter if north or south, nor if it's 90° or 270°, only the absolute value is relevant.
Cartesian coordinates unfortunately dont work in case if points are vertically alig
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GPS is an incredible piece of modern technology. Not only does it allow for locating objects precisely anywhere on the planet, but it also enables the turn-by-turn directions we take for granted these days — all without needing anything more than a radio receiver and some software to decode the signals constantly being sent down from space. [Chris] took that last bit bit as somewhat of a challenge and set off to write a software-defined GPS receiver from the ground up. As GPS started as a military technology, the level of precision needed for things like turn-by-turn navigation wasn’t always available to civilians. The “coarse” positioning is only capable of accuracy within a few hundred meters, so this legacy capability is the first thing that [Chris] tackles here. It is pretty fast, though, with the system able to resolve a location in 24 seconds from cold start and then displaying its information in a browser window. Everything in this build is done in Python as well, meaning that it’s a great starting point for investigating how GPS works and for building other projects from there. The other thing that makes this project accessible is that the only other hardware needed besides a computer that runs Python is an RTL-SDR dongle. These inexpensive TV dongles ushered in a software-defined radio revolution about a decade ago when it was found that they could receive a wide array of radio signals beyond just TV. source: Hackaday and GitHub - chrisdoble/gps-receiver
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