memo's esl project

7/30/2019 Memo's ESL Project

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Rowland Adult and Community

Education

ROWLAND HEIGHTS CA.

PROJECT


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8:47 ESL Intermedio avance 2

Table of contents

1 What is GIS.

2 Layers.

3 Scales in GIS.

4 Spatial Representation.

5 Set of attribute.

6 File formats.


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What is GIS?A geographic information system

(GIS)

1


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What is GIS? GIS allows us to view, understand, question, interpret,

and visualize data in many ways that reveal

relationships, patterns, and trends in the form of maps,

globes, reports, and charts.

A GIS helps you answer questions and solve problems

by looking at your data in a way that is quickly

understood and easily shared.


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Funciones SIG

Layers

2


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city

1:500 1:20,000

Big Scale

1:200,0001:20,000

Small

Scale

city

Scale in GIS:

The scale represents the relationship of the

distance on the map to the actual distanceon the ground.

3


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SpatialRepresentation Such as points, lines, or polygons, and a common

set of attribute columns.

4


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SET OF ATTRIBUTE.

Every layer is associated with a set of attribute.

5


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Cadastral Data SetMain cartography

RESTITUTION

The Public LandSurvey System


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File Formats

shapefiles, dBASE tables, and filetypes.

CAD

COVEREGE

Geodatabase

Shapefile

Raster

Tables

GIS6


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Shapefiles

The attributes are stored in a table database.


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Types of files CAD with extentions DXF, DWG y DitGN

Files ASCII (.txt)


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ArcView

Table ofContent

View window

Tools bar

Menu

table

Bar

Title Bar


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View of

data

layers

Map:

Cover view of data,

layers and

elements of the

map.


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Glossory

Restitution

The determination of the true (map) position of objectsor points; the image of which appears distorted ordisplaced on unprocessed aerial photographs. Restitutioncorrects for displacement resulting from both tilt andrelief displacement. Restitution in classic

photogrammetry is commonly achieved by analyticalmethods or through the use of stereoscopic plottinginstruments.

Trends. To take a particular direction.

Data Individual facts,statistics, or items or information.


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Layer .A display entity comprised of one or more components that can

be manipulated separately from other layers. There is often a

one-to-one correspondence between layers and objects, but anindividual layer may be comprised of multiple objects, such asthe red, green, and blue components used to create a singlelayer in multiple raster display.

SpatialAn adjective applied to objects that vary in space in twoor threedimensions.

Polygons Figure having three or more,usually straight,sides. Attribute.

1.-A characteristic of a geographic feature described bynumbers, characters, images and CAD drawings typically storedin tabular format and linked to the feature by a user asignedidentifier (eg. attributes of a well might include depth and gallonsper minute).2.- A column in a database table.


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CadastreA public record, survey, or map of thevalue, extent, and ownership of land as a basis of

taxation.

file formatA particular, pre-described layout pattern for data in a

computer file so it may becused or acted upon by a

program.

ShapefileIts a file name.

memo's esl project

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