Lab 8 part 1

1.  The Database Management System is a specialized computer program for organizing and manipulating data. It typically supports complex structures, to provide, security stability, and multiple.  Users often termed the database server

2.  One to one relationships occur when one entity is related to one other entity. Many to one relationships occur when one entity is related to many occurrences in another entity.  

3.  Relational databases are popular because it is a way of condensing down and joining togeather information that is in more than one spot.  It can also prevent redundancy, increase data quality and independence, create centralized control and allow multiple users.

Part 2

4.a.  stream or text

b.  stream or text

5.a.  name of  joined fields are land use discription, land use general, land use type, acres, shape long, shape area.

e.  92,236 acres

part 2

Lab 7

Ch. 7

1.  The information used in dynamic labels comes from the attribute table, like cities or road names.  You use the layer tab in the properties dialogue box to add or adjust them.

2.  To only show certain things like cities on a map you go to the layers tab in layer properties and use the SQL query button to create a query statement with just the info you want.

3.  Yes you can manually adjust labels by clicking on them and drag to desired position.

4.  To adjust graphics you use the select elements tool

5.  Two annotation types are database and map annotation

Ch. 18.

1.  True

2.  Yes, an .mxt can be saved as an .mxd.

3.  To access map template files you can chose on when starting ArcMap or you can go to file and click on new and go to my templates.

4.  To save a symbol you can save it in symbol selector dialogue box then set it as a default symbol.

5.  Two ways to change colors of a graphic is to change the color in symbol selector when choosing symbol or in the layers properties g to symbology and change color there.

Ch. 19

1.  The first thing you do when setting up a map is chose the dimensions and orientation.

2.  The scale changes when you are in layout view because the program adjusts the size of the map to fit the layout that would be printed.

3.  Three customization options for scale bar are label position, division units and text style.

It is important to zoom to 1:1 because it zooms to actual size and you can see the map at the resolution it would be on a printed page.

5.  In data view if you add a graphic you cannot adjust it in layout view.  If you add a graphic in layout view it does not show up in data view.

Lab 7

Lab 6 part 2

Lab 6 part 1

1.  When you have a large-scale map it is east to see symbols because they are larger for the small area they map is covering.  When you change the map scale to a smaller scale the symbols become much smaller and they become hard to distinguish and appear closer together.  If you increase the size of the symbol they becomes less precise in terms of location.

2.  Two ways to access they symbol colors are when in symbol selection you can choose they color when inserting symbol or you can go to layer properties and change the color of the symbols with the color ramp.

3.  In the layer properties dialogue box go to quantities then click graduated symbols

4.  Some symbology styles are public signs style, HAZMAT style, industrial style, road sign style and animal style.  (lol if you like In-n-Out)

5.  In the save layer dialogue box you must save the layer symbology as a .lyr file.

6.  Pyramids help display raster data faster by changing the size of the pixels depending on how zoomed in or out you are.  When zoomed out the pixels are bigger or coarser.  If it stayed the same size it would take forever when changing resolution. 

7.  You can left click twice slowly on it in the TOC and type in a new name.

8.  Normalization is when you divide one attribute by another to get a ratio.  This is normally used for population density.

9.  The problem with a dot density map is if you use it to show population in a polygon it sets the dots randomly and if you change or have to redo it the dot will be placed in a different spot.

Lab 5 part 2

2.
a. Basemap, Hydrology
b. NHDFlowline, NHDPoint, NHDWaterbody, Watersheds.
c. line, point, ploygon, polygon

3.
a. Vector digital data
b. Shapefile
c. yes
d. ArcGIS Geodatabase
e. yes
f. Hydrography, Stream/river, Lake/pond
g. USGS, EPA & USDA

4. a. yes

*Note: Link to CASIL website says its broken*

Lab 5 part 1

1. The advantages of using digital spatial data are that its low cost easy and quick to get a lot of spatial data and are provided in efficient forms like GPS. The disadvantages are that it is time consuming to gather data and not everything is include yet.

2. The most important question we ask our-selves when using already developed spatial-data are does it contain the information I need and is it free.

3. DOQ’s are photographic images that have been corrected for distortions due to camera tilt and terrain displacement, then georeferenced.

4. The National Hydrological Dataset is produced by the United States Geological Survey and the sources are a combination of USGS hydrologic digital line graph files and EPA reach files. The USGS files are used for spatial accuracy and the EPA files are used for attribute information. It uses North American Datum of 1983. It is a comprehensive set of digital spatial data representing the surface water of the United States using common features such as lakes, ponds, streams, rivers, canals, and oceans.
The Geospatial Data Gate way is by the United States Department of Agriculture and its source is the National Resources Conservation Service and it contains environmental and natural resources data.
The Geocommunity Data Depot is a source for SDTS format DEMs from the USGS. It also has lots of data sets downloaded from all over the Internet and is easy to access and is run by the Mindsites Group.

5. DEMs are older and need to be put together like tiles in a mosaic for large areas because they had fixed boundaries. NED provided a seamless data set in high resolution and new algorithms to remove errors created by the advancement in technology.

Lab 4 part 3

1. An ellipsoid, or spheroid, is an m mathematical surface defined by revolving an ellipse around its minor (polar) axis. It differs from a sphere because it has a bulge in the middle, the Earths orbit is an ellipsoid.

2. Latitude and Longitude lines are know as the Cartesian Coordinate System

3. The geographic North Pole is where the lines of longitude converge at the top of the globe. Magnetic north is where our compasses point to and is the axis of the Earth rotation

4. Datums are important because are 3-D frames of reference used to determine surface locations or it orientation with lines of latitude and longitude. They are created through geodetic surveying and monument points.

5. Map Projections are the transformation of coordinate locations from the earth’s curved surface onto flat maps.

6. A developable surface it is "surface" that can be flattened onto a plane without distortion

7. Lines of Longitude run north-south

8. Clarke 1866 would be great for modeling N. America because its for local areas

9. The best coordinate system for mapping countries and large areas is the Universal Transverse Mercator System or UTM. It is a global coordinate system which is better for areas spanning large regions.

10. The great circle distance is the shortest distance between any two points on the surface of a sphere measured along a path on the surface of the sphere

Lab 4 part 2

       The reason we use map projections is because some surfaces that are not flat, i.e. a sphere, need to be represented in a two dimensional form. This two dimensional form is that of a flat map and projection distorts the image of the three dimensional object so the surface will appear flat. Depending on the function of the map some distortions are acceptable and some are not. So some maps preserve the actual size of the geographic features on the map and distort the traditional square looking maps and some preserve the traditional style by sacrificing the actual shapes of the features and distances. We can compare the styles and their accuracy by measuring distances on the maps from one city to another, in this case from Washington D.C. to Baghdad, Iraq which is 9977 kilometers apart.

      The first style of conformal map projection preserves angle and shape. The first type of conformal map is the Mercator map. This map is preserving the shape of the major continents, however it makes the regions of the Antarctic extremely oversized compared to the rest of the continents, as well as Greenland but not to that extent. The distance from D.C. to Baghdad is 13,614 km, which is way over. The second type of conformal map is the Gall Steriographic. It to shows the continent of Antarctica and Greenland over sized however Antarctica is a little smaller this time, the distance between D.C. and Baghdad is much closer to the real figure at 9,565 km, which was a surprise to me.

      The second kind of map projection is the Equal Area map which preserves the area of the features on the Earth. The first style of Equal Area map is the Bonne map. It looks like a giant heart but now the continents are more proportional to each other with Antarctica and Greenland now their regular size. It is however hard to see Australia and surrounding islands but you have a very good view of the northern hemisphere. The distance from D.C. to Baghdad is also closer at 9,345 km. The second style of Equal Area map is the Hammer. The map now resembles what the globe actually looks like in sort of a football shape with all continents visible and comparatively similar. D.C. to Baghdad is over at 11,210 because the areas are equal not the distances.

      The last type of map projection is the Equidistant map. It preserves neither area nor shape but preserves distance over a short area. The first style of Equidistant map is the Equidistant Conic map. This map looks like you took a globe and butterflyed it with a knife and smashed it flat. The map is cut in the Pacific Ocean and leaves a good 45-degree section off. The continent of Antarctica is now greatly oversized again. The distance is now the closest to the real figure at 10,073 km, which is what I would expect. The second style of Equidistant map is the Equidistant Cylindrical map. For some reason this Equidistant map looks almost exactly like the Gall Steriographic map. Its not though because the map seems more stretched vertically. When I looked at the definition on Wikipedia its like they cut the globe up into a tube like shape and then it’s as if they roll it on a flat surface. The distance from D.C. to Baghdad is extremely under at 6,776 km. This could be because these maps are supposed to be good for short distances.