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Questions tagged [terminology]

Indicates questions asking about the use and meaning of specific technical words in GIS.

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51 views

What is difference between BLOB and tile in GeoPackage?

I'm new to GeoPackage, but wrote some code that will read an image file into a buffer and I then insert that buffer into the GeoPackage as a BLOB. The image files are GeoTIFFs which contain latitude, ...
2
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2answers
83 views

What is the proper name for the “Venn diagram” of a set of geometries?

Sometimes, you have a set of overlapping geometries, and you want to generate an output like this: Image taken from this answer. The resulting polygons have no overlaps; each region of space is ...
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1answer
74 views

Interpreting cell coordinates from DEM?

I'm using Environment Agency DTM LiDAR data which I import into Mathematica in ASCII format to produce ground surface models, sections, etc. The process works fine, but I'm unclear whether the cell ...
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1answer
115 views

What does percentile mean in simpleComposite of Google Earth Engine?

I was using 'ee.Algorithms.Landsat.simpleComposite' to composite images, but I'm not sure what does this 'percentile' parameter mean?
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2answers
111 views

In ArcGIS can a feature set use multiple coordinate systems?

I'm new to learning GIS and ArcMap, but have some confusion about coordinate systems. I thought I understood that there are two main types of coordinate systems, Projected Coordinate Systems which ...
2
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1answer
46 views

What part of the Census Block is the County?

I have a list of census blocks for California and I am trying to get the county for each row. If I have a census block of 60070004024003, which 2 digits make up the county FIPS?
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3answers
179 views

Adjective meaning “of the same resolution and extent”

Is there a word that can be used to describe two or more raster grids having the same resolution and extent? I'm fishing around with words like "coincident" and "coextensive," but nothing feels quite ...
6
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1answer
355 views

What does LW stand for in liblwgeom of PostGIS?

What does LW stand for in liblwgeom of PostGIS? I could not find any explanation anywhere, or in the source code (mirrored) at https://github.com/postgis/postgis/tree/svn-trunk/liblwgeom
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1answer
317 views

What does the ST prefix stand for, e.g. in ST_Polygonize?

I was just curious, and couldn't find any reference to this anywhere - is it Spatial Types? Spatial Topography? Something else?
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1answer
1k views

What is the M-Value represent

I am trying to wrap my ahead around the meaning of the M-value. I read ESRI's dictionary definition here: https://support.esri.com/en/other-resources/gis-dictionary/term/m-value and was not able to ...
2
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1answer
402 views

What is the difference between ArcGIS Desktop and ArcGIS FOR Desktop?

I keep seeing these two categories of software package on the ESRI site but nothing making it clear the difference between what ArcGIS Desktop is vs. ArcGIS For Desktop. I use ArcGIS Desktop (i think)...
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1answer
52 views

How to name this sort of edge?

I'm searching for a certain pathfinding algorithm which considers a certain sort of branch in the network. However, I find it difficult to define my search term as I do not know how this certain kind ...
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1answer
170 views

Agreed Upon Name for Rows in an Attribute Table

Is there an agreed upon name for the rows in an attribute table, perhaps one that would apply across different GIS software platforms? Esri uses "records" here, for example. They also have the ...
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2answers
1k views

What is the difference between Key-Point, Tie-Point in Photogrammetry?

I'm looking into the reports & the Mechanism of UAV Photogrammetry software like Pix4D and AgiSoft. These two words are mentioned in a lot of support documentation, but they are defined no-where. ...
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1answer
227 views

Difference between files of extension .asc, .asc.aux.xml, .aux and .rrd?

I have received ASCII data from a client. These ASCII files have been created from LiDAR data. For each tile there are 4 different file types: Filename.asc Filename.asc.aux.xml Filename.aux ...
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1answer
69 views

The term for determining the pixels of a raster image

I am looking for an english well-established term for determining: 1) invalid/nodata raster image pixels (№ 1 - black ones on the image below) and 2) valid/data raster image pixels (№ 2 - other ones ...
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1answer
34 views

Terminology for “projection” on different 2d planes (no sphere involved)

I'm building software and want to use good terminology for variables, tables, etc. Most of my work involves blueprint drawings on which I render shapes (pins, polygons, etc). The same set of pins can ...
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1answer
88 views

What does “faceting” mean in a geo/map context?

I saw some folks talking about "faceting" in relation to a map data display, what does this mean in general terms? Examples?
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1answer
187 views

model builder expressions code block and definitions

I am having difficulty wrapping my brain around the point of the expression vs the code block. What am I suppose to be defining? I copied the example from calculate value in the ArcGIS help website ...
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1answer
76 views

In which coordinates (x, y, z) are vertical grids expressed?

When working with 2D maps, coordinates are always expressed in X and Y. Adding a 3rd dimension also adds the Z-coordinate, which typically stands for height. However, when working with vertical ...
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1answer
65 views

Which projection conserves lengths?

I would like to crop rectangular fragments of given size and for these purposes I need coordinates, which covers all Earth and measured in meters. I wrote the following picture: Latitude and ...
8
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1answer
4k views

Difference between bounding box, envelope, extent, bounds?

Every time when I create a script to manipulate vector (point, line and polygon) in python I meet this doubt. What is the difference between bounding box (bbox), envelope, extent, bounds?
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1answer
77 views

What does “correctly noded” mean?

I've never seen this term, and I'm wondering what it means, with regard to ST_Polygonize NOTE: Input linework must be correctly noded for this function to work properly
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0answers
94 views

What's the difference between classification/clustering and zoning?

A week ago I had an exam and there was a question: What are the main steps of zoning in a GIS? I didn't understand the question and asked the instructor what does she mean by zoning (in ...
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2answers
1k views

Finding Similar Map Paths

I'm looking for an algorithm which, when given a particular route on a map with attributes such as incline/distance/shape/etc, can find a route which is similar (in terms of the attributes) but starts ...
3
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1answer
153 views

What is seamless spatial information?

In the of the European INSPIRE directive the following "common principles" are presented: 1. Data should be collected only once and kept where it can be maintained most effectively. 2. It ...
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2answers
60 views

What does n-D stand for in the following operator definitions?

PostGIS shows a listing of operators that make reference to n-D &&& — Returns TRUE if A's n-D bounding box intersects B's n-D bounding box. &&&(gidx,geometry) — Returns TRUE ...
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1answer
52 views

Defining Lands that are not deserts [closed]

I need to know what we call the lands that are not pure deserts that i can think that they are the areas of metropolitan areas plus rular areas or forests plus areas that are near freshwater that can ...
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2answers
681 views

How do MODIS products naming conventions work?

If I have the product MOD13Q1.A2014001, does it represent the previous 16 or the 16 days after January 1st? I.e., the product is made with 16 days, but how to determine if it was taken the previous ...
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2answers
2k views

What's the difference between “route” and “track” in OruxMaps?

What's the difference between "route" and "track" in terms of navigation? Is there a conceptual difference or only a technical one? For example OruxMaps treats the two terms differently: (source)
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2answers
40 views

Describing geographic characteristics by lat/long?

I'm not sure of the right terminology to use to google for a database of information. The data in the database should list geographic characteristics of an arbitrary lat/long. Stuff like height ...
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1answer
110 views

Simple answer: Difference between a dataset and a map [duplicate]

For a project I am involved in, we are creating a dataset that will show the extents of natural areas and provide an estimate of the ecological integrity of that area. We are calling it an "Ecological ...
3
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2answers
102 views

Describing input field in ArcMap Field Calculator window?

A few days ago I was answering Comparing two fields and printing result as 1 (if number matches) or 0 (if not) using Python Parser of ArcGIS Field Calculator? When describing the process required ...
3
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1answer
44 views

Terminology for groupings/categories within ArcGIS Pro galleries?

In ArcGIS Pro 1.1.1, when I use the INSERT tab to insert a New Layout, I am offered a gallery of layout templates to choose from. I think the terminology that I have used so far matches that found in ...
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2answers
341 views

Terminology for distinguishing ArcPy installed with ArcGIS 10.x for Desktop from that which comes with ArcGIS Pro?

ArcGIS Pro uses Python 3 whereas the other ArcGIS for Desktop applications (ArcMap, ArcCatalog, ArcScene and ArcGlobe) use Python 2 and the changes introduced with ArcGIS Pro were significant ...
4
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2answers
344 views

Is there a source for common GIS terminology in French?

I am trying to find a a resource that provides English/French translations for GIS terminology. Obviously I could use Google or a French/English dictionary, but there are many cases where there are ...
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1answer
79 views

Where is GIS categorized? [closed]

I am always in doubt as to where to categorize GIS. For instance, when you use a search engine to look for a job, you are asked to choose the category your job falls in. Or when you search for a book ...
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1answer
6k views

Primary and secondary data

If I am creating data from satellite imagery, is this classed as primary or secondary data? If I am creating slope data from a DTM, is this then classed as primary or secondary data?
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1answer
158 views

What is the meaning of DN and DRVAL2 categorie?

I try to find the meaning of the categories DN and DRVAL2 when I used them in the command: lrenderer = new QgsCategorizedSymbolRendererV2("DRVAL2" , Categrories ); Is there any tutorial or ...
4
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1answer
127 views

What is the standard terminology for raster alignment?

I would like to identify two types of raster alignment (assuming SRS is the same), but I am unsure of the correct terminology for these (or whether there is even a 'standard')? First, there is 'pixel ...
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1answer
72 views

Different kinds of time+spatial data

I work on a geospatial aggregator. We support certain kinds of temporal data, but we don't have clear names for the different types, and I don't have a clear understanding of the range of geospatial+...
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2answers
4k views

Which one is called inset map in this?

I am confused as to which one is technically the inset figure in the below map. I know an inset map is one which has more detail. But in this case which one is referred to as an inset map ...
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2answers
12k views

What are LiDAR returns?

Can someone help with an explanation and some references, in order to understand the nature of return pulses within a LiDAR system.
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0answers
32 views

Generic term for spatial data [duplicate]

I'm building an application that can accept a shapefile/mapinfo/feature class/spatialite table/etc. So - various formats from various vendors/organizations. So let's say the user is going through ...
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2answers
193 views

Preferred term for map extent box

If a (printed) map is created with an small map in the corner showing the extent of the main map frame in relation to the state/province etc. with a box. What is the proper cartographic term to label ...
4
votes
1answer
2k views

Difference between 'join' and 'merge'?

Suppose one wants to make polygons A and B, and their respective attributes to be one unique polygon C. What is this GIS operation called? Is there any difference in GIS terminology about "joining" ...
3
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2answers
86 views

Generic term for CRS axes?

We're making a light web front to a database, and I saw this in a test screenshot: Despite those coordinates being nowhere near North America, the "latitude/longitude" label for those coordinates ...
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1answer
50 views

Refering to 0° of longitude/latitude in a range

This is more of a question in diction... In scientific writing, is there a preferable way to write a range, bounded by 0° longitude, in a way similar to "5° W to 10° E" if there is no cardinal ...
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3answers
1k views

What is the opposite of height? [closed]

Considering that depth denotes the distance below sea-level to a point on an object located below sea level, and considering that height denotes the distance to some point above the surface of the ...
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2answers
257 views

“Official” definition to hyperspectral sensor

I was checking in the literature about a formal definition for hyperspectral sensors, and the most complete definition I found was from The Center of Space Research (@ University of Texas in Austin): ...