However, it's debatable whether you should be re-importing images
which were created using the PNG driver into GRASS. For
zooming/panning around a map (or series of maps), you would normally
create a new PNG file each time, by the same means that the original
PNG file was created.
Ideally, this would be the case, but some of the data files are large areas
such as continents. I'd like to be able to show the world first, then the
user click on any place in the map and it zooms into an area such as a
continent or perhaps something a little closer (at some point I imagine I'll
have to create another higher resolution map of that area as they get
closer). As they keep clicking, they zoom in closer and closer until they
get to a country or state or city. Then I will give them information on that
area such as official bird, tourist landmarks, or other items of interest.
I'm a beginner at this, so I could be going about it totally wrong. I'm
open for suggestions though.
> However, it's debatable whether you should be re-importing images
> which were created using the PNG driver into GRASS. For
> zooming/panning around a map (or series of maps), you would normally
> create a new PNG file each time, by the same means that the original
> PNG file was created.
Ideally, this would be the case, but some of the data files are large areas
such as continents. I'd like to be able to show the world first, then the
user click on any place in the map and it zooms into an area such as a
continent or perhaps something a little closer (at some point I imagine I'll
have to create another higher resolution map of that area as they get
closer). As they keep clicking, they zoom in closer and closer until they
get to a country or state or city.
Zooming in on a rendered image will simply magnify the individual
pixels. E.g. if you render a continent-scale image, then enlarge it by
a factor of ten, each pixel in the original image will become a 10x10
square in the zoomed image.
You will get much better results if each image is created directly
from the original high-resolution data.
> However, it's debatable whether you should be re-importing images
> which were created using the PNG driver into GRASS. For
> zooming/panning around a map (or series of maps), you would normally
> create a new PNG file each time, by the same means that the original
> PNG file was created.
Ideally, this would be the case, but some of the data files are large
areas such as continents. I'd like to be able to show the world first,
then the user click on any place in the map and it zooms into an area
such as a continent or perhaps something a little closer (at some
point I imagine I'll have to create another higher resolution map of
that area as they get closer). As they keep clicking, they zoom in
closer and closer until they get to a country or state or city. Then I
will give them information on that area such as official bird, tourist
landmarks, or other items of interest. I'm a beginner at this, so I
could be going about it totally wrong. I'm open for suggestions
though.