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Garmin introduces the New Series : ECHOMAP Ultra
By Lurker,
Garmin announced the ECHOMAP™ Ultra series, a new line of keyed-assist 10- and 12-inch touchscreen chartplotters designed to bring professional performance to inland and nearshore anglers. Offering a best-in-class sonar solution, the ECHOMAP Ultra series has built-in support for Garmin’s crystal-clear Ultra High-Definition scanning sonar as well as the award-winning Panoptix LiveScope™ series, including the new single-array LVS12, that delivers live scanning sonar images of structure, bait and f
[Paper] Draw a perimiter around a city and see if it includes a pre-determined location
By KingBis,
Hello,
I'm not sure where to post this question, being a little lost in this new world. So if this is not the right place, I apologize in advance.
I'm currently writing an economic paper and I'm, among others, using precipitation data. However, I do not have data for each city, only for a subsample (which have a weather station nearby).
I have the gps coordinates of the cities and the gps coordinates of the weather stations. What I'm trying to do is to "draw" a perimeter around ea
Oracle Spatial prerequisites
By darksabersan,
Hi guys,
I had the opportunity in the past with my previous job to load Oracle Spatial data and everything was fine.
Today, I try to scratch the surface by installing Oracle Database 12c Release 2.
I created a first database and I managed to make a connection with ArcCatalog without major problem.
Now I have created a second empty database but when I want to connect with QGIS, it does not work even using the 'SYS' user.
What should I do to create an empty base to connect to?
Israel Aerospace Industries releases anti-jammer for GNSS systems
By Lurker,
Israel Aerospace Industries (IAI) has unveiled ADA-O, a new version of its ADA system that prevents GNSS signals from being jammed.
ADA-O is designed for armored vehicles and other larger land and sea platforms. According to the company, it can be integrated with ease to protect navigation, telecommunications, command-and-control and other systems. The land platform can be readily integrated in a range of platforms, providing a unique operational response to helps telecom, navigation and C&
Landsat 8 Mosaic (NDVI) Overlapping?
By serdawe,
Hello all,
I have downloaded 3 satellite images (Landsat 8 OLI TC1P), in three different periods (two images are from Mart 4. 2017. and the one is from Mart 20. 2017). I have joined (made mosaic) them in ENVI and have got mosaic with overlapping (Figure 1). Next, I have obtained NDVI in Arc Map and got NDVI with inappropriate values in the overlapping part of the image (Figure 2).
Do you know how to manage this problem?
Thank you in advance!
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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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