Spatial - Ed.com

Differential correction with NA2011 and the newest epoch of NAD83

See our and Datums Basics and GPS Tutorials for the long-awaited results of months of rigorous testing and peer review

Trimble Positions software has replaced Trimble GPS Analyst in ArcGIS 10.1

ALASKA GPS and GIS users - check out Joel Cusick's Datum and Projections presentation Feb 2013

ArcGIS 10.1 - New and Cool improvements see Presentation from Melita Kennedy, ESRI : Projections and Datums Dec 2012

Home GDB Tutorials ArcGIS Data Types
ArcGIS Data Types PDF Print E-mail

Data types listed here apply only for personal GDBs

 

Name Specific range, length, or format Size (Bytes)
Applications
Short integer -32,768 to 32,767 2 Numeric values without fractional values within specific range; coded values
Long integer -2,147,483,648 to 2,147,483,647 4 Numeric values without fractional values within specific range
Single precision floating point number (Float)
Approximately
-3.4E38 to 1.2E38
4 Numeric values with fractional values within specific range
Double precision floating point number (Double) Approximately
-2.2E308 to 1.8E308
8 Numeric values with fractional values within specific range
Text Up to 64,000 characters Varies Names or other textual qualities
Date mm/dd/yyyy
hh:mm:ss
A/PM
8 Date and/or time



Choosing a data type

Numeric

In choosing a numeric data type, first consider the need for whole numbers versus fractional numbers. For whole numbers, specify a short or long integer. For numbers with decimal places, specify a float or a double.
Secondly, when choosing between a short or long integer, or between a float and double, choose the data type that takes up the least storage space required. This will not only minimize the amount of storage required but will also improve performance. If you need to store integers between -32,768 and 32,767 only, specify the short integer data type, because it takes up only 2 bytes, whereas the long integer data type takes up 4. If you need to store fractional numbers between -3.4E-38 and 1.2E38 only, specify the float data type, because it takes up 4 bytes, whereas the double data type takes up 8.

Text

A text field represents a series of alphanumeric symbols. A numeric value i.e. 123 can be entered but as text it is no longer quantitative and cannot be used in mathematical calculations.

Date

When a date field is assigned to an attribute in the table for a feature class this is passed along to ArcPad for the data entry form in the form of a calendar.  To accept the current data put a check in the box beside the date. To change the date tap on the date field and you will see the calendar.