What does on the fly mean in GIS?
something created when needed
In colloquial use, “on the fly” means something created when needed. The phrase is used to mean: something that was not planned ahead. changes that are made during the execution of some activity: ex tempore, impromptu.
Why is on the fly projection important?
Projection on the fly ensures that the data draws in the map’s coordinate system (NAD 1983 CSRS Statistics Canada Lambert), even though it is still stored in two other coordinate systems (WGS 1984 and WGS 1984 Web Mercator). ArcGIS will always apply projection on the fly when it’s needed.
How do I enable the fly projection?
To enable “on the fly” projection, click on the CRS Status button in the Status Bar along the bottom of the QGIS window:
- In the dialog that appears, check the box next to Enable ‘on the fly’ CRS transformation.
- Type the word global into the Filter field.
- Click on the NSIDC EASE-Grid Global to select it, then click OK .
What is a projection in GIS?
A projection is the means by which you display the coordinate system and your data on a flat surface, such as a piece of paper or a digital screen. Mathematical calculations are used to convert the coordinate system used on the curved surface of earth to one for a flat surface.
What is coordinate transformation in GIS?
Coordinate transformation is a common operation in the development of spatial data for GIS. A coordinate transformation brings spatial data into an Earth based map coordi- nate system so that each data layer aligns with every other data layer.
What does ArcMap do if you put several data sets with different coordinate systems in the same data frame?
When displaying multiple datasets with different coordinate systems, ArcMap will project the data ‘on-the-fly’ to the coordinate system that is set for the Data Frame: If the proper geographic (datum) transformation is not specified, the data will not line up properly with other data displayed in the map document.
What is meant by Reprojection?
Wiktionary. reprojectionnoun. Projection again or anew; the act of reprojecting.
Why is it called on the fly?
In a hurry, on the run, as in I picked up some groceries on the fly. The transfer of this expression, which literally means “in midair or in flight,” dates from the mid-1800s.
What does living on the fly mean?
To do something on the fly is to do it quickly. When people rush, they’re working on the fly. Sometimes people take their time, doing things slowly, carefully, and deliberately.
How does a projection on the fly work?
It unprojects the data into geographic coordinates (latitude and longitude). It transforms the geographic coordinates into the new geographic coordinate system. It projects the geographic coordinates into the new projected coordinate system. Sometimes it only has to do one of these things; sometimes it has to do all three.
When is the data projected on the fly?
The new projection is used for display and query purposes only; the actual data is not altered. When is data projected on the fly? Data is projected on the fly anytime a data frame contains a layer whose coordinate system is defined as something different from the coordinate system definition of the data frame.
How does ArcMap do on the fly projection?
ArcMap can perform what is commonly known as on-the-fly projection. This means ArcMap can display data stored in one projection as if it were in another projection. The new projection is used for display and query purposes only. The actual data is not altered.
What does the phrase ” on the fly ” mean?
Colloquial usage. In colloquial use, “on the fly” means something created when needed. The phrase is used to mean: something that was not planned ahead changes that are made during the execution of some activity: ex tempore, impromptu.