OS Grid Ref. A source of possible confusion to be aware of is that a grid reference identifies a square (with the size of the square determined by the number of digits), whereas a latitude/longitude coordinate identifies a point (with precision implied by the number of digits).

Table of Contents

## How do you convert degrees to grid references?

- 1 convert (geodetic) latitude/longitude to geocentric cartesian coordinates: e² = (a²−b²) / a²
- 2 apply Helmert transform. The 7-parameter Helmert transform is given by:
- 3 convert cartesian co-ordinates back to latitude/longitude.

## What is the difference between grid reference and latitude?

OS Grid Ref. A source of possible confusion to be aware of is that a grid reference identifies a square (with the size of the square determined by the number of digits), whereas a latitude/longitude coordinate identifies a point (with precision implied by the number of digits).

**How do I convert coordinates to a UTM grid reference?**

Geographic to Grid Calculator Enter the latitude and longitude coordinates (note for the Southern hemisphere, degrees latitude must be prefixed with a minus (-) sign) and then press Submit Data A full UTM Grid reference will then be displayed. By way of example, the Mt Wilson Fire Station has a full Grid reference of 255495 6289620.

**What is the format for latitude and longitude readings?**

Note that latitude or longitude references are sometimes given in the format (for example) S33 30.317 E150 22.052. GPS readings are often outputted in this format. Here the Seconds are displayed as a decimal and must be converted to a number by multiplying by 60. The resultant number will always be between 0 and 60.

### How do we measure latitude&longitude?

Before going further, I have to mention that, at a fine level of accuracy, there are different ways of measuring latitude & longitude. The Ordnance Survey uses ‘OSGB-36’, based on an elliptical model of the earth’s surface which is a good fit to the UK.

### How do you convert Eastings and Northings to grid reference?

To convert a National Grid Reference to Eastings and Northings:

- Remove the two letters at the beginning of the reference: e.g. NS1234 becomes 1234.
- Split the reference into it’s East and North components: e.g. 12 East and 34 North.
- Work out the numerical reference for the two letters: e.g. NS = 200km East and 600km North.

**How do I find my NZTM coordinates?**

How to use

- Open the Zoom to Point tool from the tool menu.
- Select your chosen coordinate system (NZTM for this example)
- To generate coordinates based on a map location, click on the map and a yellow circle will appear – coordinates will appear in the Easting (X) and Northing (Y) boxes.

**How do you convert XY coordinates to latitude and longitude?**

Calculate latitude and longitude using the formula: latitude = asin (z/R) and longitude = atan2 (y,x). In this formula, we have the values of x, y, z and R from step 2. Asin is arc sin, which is a mathematical function, and atan2 is a variation of the arc tangent function. The symbol * stands for multiplication.

## How do I convert coordinates to WGS84?

How to convert to WGS84

- Select input / output spatial references.
- Input coordinates using decimal format.
- Click on the ‘Transform’ button to get the result.
- Your coordinates will be converted using the output spatial reference.

## How do you convert a grid reference to latitude and longitude?

Divide the length of the x-axis by 180 and the y-axis by 90. This will give you the equivalent of each latitude (LA) and longitude (LO) angle in inches. Mark the coordinates of a location on the two axes.

**What are my Eastings and Northings?**

The vertical lines are called ‘eastings’, as they increase in value as you travel east on the map. The horizontal lines are called ‘northings’ as they increase in value as you travel north on the map.

**What is NZTM coordinate system?**

NZTM 2000 is the official projection for New Zealand topographic mapping. Web Mercator is used worldwide and the de facto coordinate system for web mapping applications such as Google Maps, Mapbox, and Bing Maps.

### How do I put XY coordinates into Google Maps?

Enter coordinates to find a place

- On your Android phone or tablet, open the Google Maps app .
- In the search box, enter your coordinates. Here are examples of formats that work: Decimal degrees (DD): 41.40338, 2.17403. Degrees, minutes, and seconds (DMS): 41°24’12.2″N 2°10’26.5″E.

### How do you convert XY coordinates to degrees minutes seconds?

Follow these steps to convert decimal degrees to DMS :

- For the degrees use the whole number part of the decimal.
- For the minutes multiply the remaining decimal by 60. Use the whole number part of the answer as minutes.
- For the seconds multiply the new remaining decimal by 60.

**How do you convert WGS to UTM?**

- Navigate to the following location using catalog window / ArcCatalog. C:\Program Files (x86)\ArcGIS\Desktop10.2\Reference Systems.
- In a new arcmap session add “utm.shp” from the above location.
- Add your location layer ( which is in WGS)
- Use Identify tool and click on the city.
- You will find zone in the identify window.

**What is the difference between 4 and 6 figure grid references?**

What is the difference between four-figure and six-figure grid references? Four-figure grid references are used to find a grid square but we can use six-figure grid references to find an exact location within a grid square. Six-figure grid references are much more accurate than four-figure grid references.

## How do you read a grid reference on a map?

When taking a grid reference, always read left to right along the bottom or top of the map first and then bottom to top along the side of the map. This is particularly important in an emergency situation.

## What is the difference between geographic coordinates and projected coordinates?

What is the difference between a geographic coordinate system (GCS) and a projected coordinate system (PCS) anyways? Here’s the short answer: A GCS defines where the data is located on the earth’s surface. A PCS tells the data how to draw on a flat surface, like on a paper map or a computer screen.

**How do you convert lat long to grid references?**