Dan Foster

List of Map Sets

14 posts in this topic

I'd like to start a list of map sets that contain a number of maps that can be seamlessly tiled together to form a larger map. Many people have asked for the Scanned Maps feature to be able to load multiple maps from the same set and tile them together automatically. Before I start developing such a feature, I'd want to look at as many potential map sets as possible to make sure I'm developing a solution that addresses all of them.

I'm going to assume that most of these map sets were generated by a state or national agency and are available online.

Here's what I'd like to see:

Quick description of the map set

Coverage (ie, all of MA)

Specifics about the projection used, and whether a worldfile exists for each map

A link to the data overview page

A link to the data directory where the actual imagery lives

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MassGIS 1:5000 Color Orthos

Statewide (MA)

The MassGIS color orthos are excellent. If you can include the MassGIS scans of the USGS 1:24/25K topo maps as well, that would be wonderful. It's a much better scan than Terraserver offers. My current solution for those map tiles is a quick program I wrote that accepts the top-left tile index, the bottom-right tile index, and it figures out which tiles are needed to complete that rectangle, and then stitches all of them together into one image.

It's cheesy, but it works. I build those maps for the MA state parks that I frequent the most.

http://www.mass.gov/mgis/im_quad.htm

Same projection, etc. as the MA GIS color orthos.

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ChartTiff sells modified USGS DRGs that they call "Geos" which are squared off so they can be tiled.

I downloaded a sample and didn't think the bottom section was lined up very well. I've been planning on seeing how it would compare to what I could do.

One way or another, I've been thinking of putting squared off DRGs on my CDROM. I gather some GIS programs can load them and the user doesn't have to worry about transparent colors. In other words, I don't mind ExpertGPS requiring the user to provide scanned maps that are tile-able if they want to tile the maps.

In the interest of getting new functionality quicker, I might suggest that transparency be skipped and assume the image files can be tiled. Then the basics are the calibration data (upper left geo-coordinates and resolution, datum, projection, etc.).

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2006 Arkansas Statewide DOQQ, Natural Color, 1 Meter Pixel Resolution

Statewide (AR)

NAD83 UTM Zone 15, GeoTiffs with world files and JPEG2000 with world files

http://www.geostor.arkansas.gov/Portal/ftpaccess.htm

ftp://ftp.geostor.arkansas.gov/ADOP2_DOQQ_RGB_GEOTIF/

---------------------------------------

2006 Washington County Arkansas DOQQ, Natural Color, 1 Foot Pixel Resolution, GeoTiff

Washington County Arkansas

NAD83 Arkansas State Plane North Zone, US Survey Foot, Tiffs with world files

http://www.geostor.arkansas.gov/Portal/ftpaccess.htm

ftp://ftp.geostor.arkansas.gov/geostor_ra...INGTON_CO_2006/

------------------------------------

2006 Benton County Arkansas DOQQ, Natural Color, 6 Inch Pixel Resolution, GeoTiff

Benton County Arkansas

NAD83 Arkansas State Plane North Zone, US Survey Foot, Tiffs with world files

http://www.geostor.arkansas.gov/Portal/ftpaccess.htm

ftp://ftp.geostor.arkansas.gov/geostor_ra...BENTON_CO_2006/

-------------------------------------------

University of Arkansas Monticello Spatial Analysis Lab (collared, collarless, or collarless hillshaded USGS DRGs at 1:24000 and 1:100000)

Statewide (AR)

UTM Zone 15 NAD83, GeoTiffs with world files for all but collarless hillshaded, MrSid and world file for collarless hillshaded

http://sal.uamont.edu/pages/nsdd/Arkansas_State.htm

No one directory...Arranged by county...get to them from http://sal.uamont.edu/pages/nsdd/Arkansas_State.htm

The collarless DRG's have no transparent pixels. The map is extended slightly beyond the traditional quadrangle to "square up" with the UTM grid. This means that there is some small overlap between adjacent collarless DRG's.

---------------------------------

University of Arkansas Monticello Spatial Analysis Lab (black and white and CIR USGS DOQs at 1:24000)

Statewide (AR)

UTM Zone 15 NAD83, Tiffs with world files and MrSid and world files .

http://sal.uamont.edu/pages/nsdd/Arkansas_State.htm

No one directory...Arranged by county...get to them from http://sal.uamont.edu/pages/nsdd/Arkansas_State.htm

---------------------------------

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In reply to Dan A. - yes, I'm working with the assumption that the images do not have any collars at all, which implies that the image extends to all four vertical and horizontal edges. That might rule out DRGs where the map edge isn't parallel to the pixel edge.

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In reply to Dan A. - yes, I'm working with the assumption that the images do not have any collars at all, which implies that the image extends to all four vertical and horizontal edges. That might rule out DRGs where the map edge isn't parallel to the pixel edge.

Yes, it would rule out standard DRGs or DRGs that only had the collar stripped. The ChartTiff Geos I mentioned are modified like the ones that Tim mentioned for Arkansas. The triangular border area left after collar stripping is filled with the adjacent map so the image extends to all four edges and is rectangular.

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I like the idea of having a digital elevation model (DEM) as a base map. What I know about this is now more than 10 years old. The format technology seems to have slipped past me. Here is a link to a web page of the DEM theme: http://data.geocomm.com/dem/

DEM's that I worked with were grid sampled from USGS topographic maps which are themselves interpolated from stereo-pair aerial photography. So I would expect some inconsistancy between DEM's and good GPS positioning.

DEM data can be mapped into terrain models, but my favorite is a map of slope. Mapped in gray scale, for example, flat ground is dark, steep ground white; landforms are visable in a way that I find astounding. In volcanic terrane, individual lava flows are accentuated. In glaciated mountainous terrain, the carving by individual glaciers stands out. Landslides, being of weaker, gently sloped soil, stand out.

Some would suggest that I go spend thousands of dollars and hours on GIS hardware and software to do this, but I'm suggesting creaming that functionality for some the best functions to have in ExpertGPS.

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2003 1 meter NAIP imagery

Minnesota

NAD83/UTM Native Zone MrSid w/ worldfiles

http://www.lmic.state.mn.us/chouse/naip03mrsid.html

2002,2003,2004 1 and 2 meter NAIP imagery

1:24k, 1:100k, 1:250k USGS DRG w/ collars removed

1 meter, 3 meter USGS DOQ

Minnesota

NAD83/UTM Zone 15E (extended) Geotiff and ECW w/ worldfiles

http://deli.dnr.state.mn.us/data_search.html

Tons of North Dakota data

http://www.nd.gov/gis/mapsdata/download/

All years/1 and 2 meter NAIP imagery

United States

NAD83/UTM Native Zone MrSid w/ worldfiles

http://datagateway.nrcs.usda.gov/

(note that newer images are MrSid Gen3) I believe they also provide DRG's and DOQ's but I have never downloaded them.

2000 NASA Landsat7 ETM+

World

WGS84/UTM MrSid w/ worldfiles

14.25meter resolution

https://zulu.ssc.nasa.gov/mrsid/

2005 NASA Blue Marble Next Generation

Seasonal World (12 sets)

WGS84/Plate Caree projection

w/ or w/o topo shading as jpeg or png

http://visibleearth.nasa.gov/view_set.php?categoryID=2355

NASA Landsat7 WMS Global Mosaic

Don't know anything about the file format except they already have xml code available to retrieve tiled images. (I believe Topofusion uses this data in addition to the Terraserver stuff).

http://onearth.jpl.nasa.gov/tiled.html

Chris Bolstad

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MODerate resolution Imaging Spectrometer (MODIS) seamless subsets are found here:

http://rapidfire.sci.gsfc.nasa.gov/fas/

An additional seamless subset for Australia is seen here:

http://rapidfire.sci.gsfc.nasa.gov/subsets/

Projection and datum information here:

http://rapidfire.sci.gsfc.nasa.gov/faq/#faq08

"All the images ... are in the public domain and can be freely used and reproduced for any purpose." Although resolution is "moderate" (best 250 meters/pixel), images are updated daily.

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Minnesota

1:24k, 1:100k, 1:250k USGS DRG w/ collars removed

I downloaded one of the DRGs with collars removed and it was NOT squared off so not readily tile-able.

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B)-->

QUOTE(Ken B @ Apr 5 2007, 11:47 AM)
I like the idea of having a digital elevation model (DEM) as a base map. What I know about this is now more than 10 years old. The format technology seems to have slipped past me. Here is a link to a web page of the DEM theme: http://data.geocomm.com/dem/

DEM's that I worked with were grid sampled from USGS topographic maps which are themselves interpolated from stereo-pair aerial photography. So I would expect some inconsistancy between DEM's and good GPS positioning.

DEM data can be mapped into terrain models, but my favorite is a map of slope. Mapped in gray scale, for example, flat ground is dark, steep ground white; landforms are visable in a way that I find astounding. In volcanic terrane, individual lava flows are accentuated. In glaciated mountainous terrain, the carving by individual glaciers stands out. Landslides, being of weaker, gently sloped soil, stand out.

Some would suggest that I go spend thousands of dollars and hours on GIS hardware and software to do this, but I'm suggesting creaming that functionality for some the best functions to have in ExpertGPS.

Hi,

I suggest that you go to: http://www.delorme.com/flyover/ and watch the movie. Then look at the rest of the 3D display options. I was very impressed.

The price is just under $100 for Topo6 for 3D Topo maps for the entire USA.

Both Topo6 and ExpertGPS have their strengths and I use both. The Topo 6 maps are crisper and more up to date with 3D display capabilities. The Terraserver Topo Maps are old and clumsy looking.

ExpertGPS has the free Terraserver aerials and much better trail, waypoints and other handling.

Topo 6 has automatic Road and Trail routing generation.

The price of the aerials from DeLorme is way out of my price range but the similar Terraservers aerials are free for use with ExpertGPS.

I am starting to get an Idea that we should start a campaign to make Dan Foster a multi - Millionaire by suggesting that DeLorme purchase ExpertGPS and then hire him to continue as now developing ExpertGPS, EasyGPS and GeoBuddy .... This would expand DeLorme's offerings to include another window into their mapping data that many would choose. ExpertGPS would have access to more mapping data, free as now and additional like is being suggested currently. In any case DeLorme will be taking a hit in their pricing of the additional mapping data as ExpertGPS can display more free data seamlessly.

This entire discussion shows me that Topo6 and ExpertGPS are heading into the same areas but each with different features that sometimes do not fill all together smoothly and perhaps two program choices for the end user for Topo mapping user are the best way to go.

Stephen H. Fischer

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I suggest that you go to: http://www.delorme.com/flyover/ and watch the movie. Then look at the rest of the 3D display options. I was very impressed.

Thanks, Stephen. I'm actually a convert from Topo2 to ExpertGPS. While snickering about the thought of Dan hanging with Donald Trump, I'm trying to think how to describe my long-standing attraction to ExpertGPS... I think this thread is a prime example. Dan has asked us what seamless imagery we know of that might be called into ExpertGPS. Delorme, who still sends me ads, never asked me anything!

Back to seamless data, I found collars on the NGDC Coastal Relief Model, http://www.ngdc.noaa.gov/mgg/bathymetry/relief.html

When I contacted author Dan Metzger, he provided some quads at higher resolution than those available from that page. I wonder if on a cold snowy day, he might make a collarless data set?

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Old topic revisited...  I'd like to see DEM as a map option.  I'd also like to see a slope toggle on the map options, that is DEM is rendered as slope, derived from DEM.  Put this in ExpertGPS Pro and I'd be propelled to upgrade!  Slope maps are very interesting way to view the DEM.  A slope map of Mount Shasta shows individual lava flows on the volcanic pile.  Also a great way to view topography.  Here's a sample at ArcGIS   http://www.arcgis.com/home/item.html?id=a1ba14d09df14f42ad6ca3c4bcebf3b4

where slope bins are mapped.  Continuous color scale from 0-100% is useful.  

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