on February 10, 2023
Why side looking?
Geographic Information SystemsWhy do we use side-looking system in range measurement? Side-looking radars are used to obtain higher resolution than conventional radar, improving the ability to recognize surface targets. Why is synthetic aperture radar side-looking? Radar has to view obliquely so that the time delay of the echo is proportional to the distance across the swath. That’s
on February 10, 2023
Problem importing sqlite into Postgres (with PostGis) using ogr2ogr
Geographic Information SystemsHow to import SQLite database into PostgreSQL? The following steps will help you in connecting SQLite to PostgreSQL using the Fixture method: Step 1: Create SQLite DB Dumpdata Backup. Step 2: Generate a Postgres DB and User. Step 3: Configure Settings.py. Step 4: Import Required Fixture via Loaddata from SQLite to PostgreSQL. Is SQLite
on February 10, 2023
Map does not appear upon opening print composer in QGIS
Geographic Information SystemsHow do I add a map to print layout in QGIS? Quote from video: To add a print layout to go to the project menu and choose new print layout you'll be asked to give a name we can have multiple print layouts in a project and print layouts are saved in the project. Where
on February 10, 2023
QGIS: Show label only when corresponding marker is displayed
Geographic Information SystemsHow do I only show certain labels in QGIS? In QGIS 2.0 you find the setting “data defined/show labels” at Labels -> Rendering -> Label options. For this the labelling must be activated with the certain attribute. With a click on “Edit…” the expression string editor opens, which some of you should know from the
on February 10, 2023
Geocode an address and then buffer
Geographic Information SystemsHow can I geocode an address for free? Google Maps This free platform will allow you to geocode virtually any type of location. Plotting one location is simple. Just go to Google Maps and type your query into the search bar. Whether it’s an address, zip code, or any other type of location, Google will
on February 10, 2023
Generating a polygon tile index from multiple vector datasets
Geographic Information SystemsHow do I create a vector tile package? Create vector tiles Highlight the map in the Contents pane. On the Share tab, in the Share As group, click the Web Layer menu and click Publish Web Layer . In the Share As Web Layer pane, on the General tab, under the Layer Type heading, choose
on February 9, 2023
Is Tiger/Line 2010 Data Inaccurate? What’s more reliable?
Geographic Information SystemsIs nominatim reliable? On average Nominatim does great job and correctly geocodes around 70% of addresses, while best commercial services can geocode around 90%. What agency creates and maintains Tiger Files? The TIGER/Line Shapefiles are the fully supported, core geographic product from the U.S. Census Bureau. They are extracts of selected geographic and cartographic information
on February 9, 2023
SetTimeout in Earth Engine
Geographic Information SystemsHow does the Earth Engine Work? Earth Engine hosts satellite imagery and stores it in a public data archive that includes historical earth images going back more than forty years. The images, ingested on a daily basis, are then made available for global-scale data mining. What code does Earth Engine use? JavaScript The Google Earth
on February 9, 2023
Approximate distance between two points (longitude / latitude) without Haversine
Geographic Information SystemsHow to calculate the distance between two points using longitude and latitude? Quote from video: So if you want to calculate the distance uh this is the formula d by r have a sine phi 2 minus 5 1 plus cos of phi 1 into cos of phi 2 into half sine of lambda 2
on February 9, 2023
Defining projections for multiple shapefiles in ArcMap?
Geographic Information SystemsHow to do batch projection in ArcGIS? Note: To define the coordinate system of files in a batch process in ArcGIS versions 10. x, navigate to ArcToolbox > Data Management Tools > Projections and Transformations. Right-click Define Projection, and click Batch. How do I assign a projection to a shapefile? Defining a shapefile’s coordinate system