Wednesday, August 31, 2011

Quiz #2, GIS Challenge

Part I
1. Rank order the ten most populous countries of the world.
1. China
2. India
3. United States of America
4. Indonesia
5. Russia
6. Brazil
7. Pakistan
8. Japan
9. Bangladesh
10. Nigeria

I selected the country layer on ArcMap, right click to show attribute table. Scrolled to see the POP_CNTRY, right click to put in descending order.

2. How many rivers does the Amazon river system consist of?
15 rivers- Amazon, Guapore, Japura, Madeira, Madre de Dios, Purus, Putamayo, Rio Branco, Rio Juruena, Rio Maranon, Rio Negro, Rio Teles Pires, Tapajos, Ucayali, Xingu

I selected the country and rivers layer, right click to show the attribute table. Under system, I doubled clicked so it sorted according to the system.

3. How many cities are within 500km of the Amu Darya and Syr Darya rivers? Attach a screen shot of a table for these cities.
37 + 52= 89 cities

 
I clicked the attribute table of the river layer, selected the 2 rivers. Then I clicked Selection > Select by location > Selection Method is select features from cities and the source layer is rivers > Spatial Selection method is "features within a distance of source layer", check apply a search distance, typed 500 km, then clicked OK. The region would be shown, then clicked the cities layer and opened the attribute table.  

4. To the nearest 100,000 what is the total population of countries within 300 kilometers of Iran (not including Iran)?
452,300,000
I first select by attributes > layer: country  > name > "CNTRY_NAME" = 'Iran'. Then I
Select by location > Target layer: cntry02 > source: cntry02 > Spatial selection method within a distance is 300 km and clicked OK. Then I opened the attribute table from cntry02 layer with the selected feature > statistics on POP_CNTRY.


5. Identify the most and least populous countries of the landlocked countries of the world. 
 Most populous country- Vatican City
Least populous country- Ethiopia

With the country layer selected, I right-clicked to go to the country attribute table. Scrolled to see the Landlocked column, selected the Y of landlocked countries, then clicked Show selected records. Then I right-clicked on pop_cntry > Sort descending. Then I looked for the most and least populous countries.

6. Identify all countries within 300 kilometers of Veszprem, Hungary (not including Hungary).
Poland
Czech Republic
Slovakia
Austria
Slovenia
Hungary
Romania
Croatia
Bosnia & Herzegovina
Yugoslovia 


I clicked the Attributes table of country > selected Hungary> Select by location > "Select features from" > Target layer is cntry02 > Source layer is cntry02 > Spatial selection method is "Target layer within a distance of the source layer feature" > and clicked OK. Then I opened the Attribute table of the country layer > Show selected records, excluding Hungary.

7. What countries border Chad? 
Libya
Niger
Sudan
Nigeria
Central African Republic
Cameroon

I clicked the Attributes table of country > selected Chad > Select by location > "Select features from" > Target layer is cntry02 > Source layer is cntry02 > Spatial selection method is "Target layer features touch the boundary of the source layer feature" > and clicked OK. Then I opened the Attribute table of the country layer > Show selected records, excluding Chad.

8. Rank order of the five countries that have the most cities based upon the data. And what is the city number for each? 
1. Russia- 97
2. United States- 93
3. Thailand-72
4. Turkey-67
5. Cote d'Ivory and Poland (tied)- 50


I  first opened ArcToolbox > Analysis tool >Statistics > Frequency >Input table- cities> Output table > Frequency field- Country name > OK. A new table will show up, so I opened the table > right-clicked frequency > sort by descending.

Part II 

9. Approximate the total length (km) of all river portions /segments flowing in the country of Sudan.
The rivers flowing in the country of Sudan are the Nile, the White Nile, and Blue Nile, approximating 3920km.


2936km +361km + 623km = 3920 km


I first selected Sudan as the location, then selected the rivers in Sudan, the Nile, White Nile, and Blue Nile. Then using the measure tool, I clicked down, following each river through Sudan and putting down each length for each segment and added them together.

10. Rank order of the five countries that have the most lakes in terms of number. And what is the lake number for each of the five countries?
1. Russia- 1516
2. Canada- 1340
3. United States-743
4. China-219
5. Sweden-168

I  opened ArcToolbox > Analysis tool >Statistics > Frequency >Input table-lakes> Output table > Frequency field- Country name > OK. A new table will show up, so I opened the table > right-clicked frequency > sort by descending.
 
11. Rank order of the five countries that have the most lakes in terms of area. And what is the total lake area (square km) for each of the five countries?


12. Produce the following map: a world country map of lake area per capita (area of lake surface per person).