"Using Coordinates to Represent Geographical Locations" Plane Cartesian Coordinate System PPT Courseware

Description

"Using Coordinates to Represent Geographical Locations" Plane Cartesian Coordinate System PPT Courseware

1. Learning objectives:

1. Understand the significance and main processes of using a plane rectangular coordinate system to represent geographical location; improve the ability to solve practical problems;

2. Through learning, you can use a plane coordinate system to describe geographical location; develop your own spatial concept;

3. Further understand the role of the rectangular coordinate system in real life.

4. Cultivate a serious and rigorous attitude towards work by using coordinate systems to represent some geographical locations in real life.

2. Learning Key Points:

Use coordinates to represent geographic location.

3. Difficulties in learning:

1. How to establish an appropriate Cartesian coordinate system;

2. Use the plane rectangular coordinate system to solve practical problems.

induction

The process and method of using coordinates to represent geographical location is:

(1) Establish a coordinate system, select a _______ reference point as the origin, and determine the _______ of _______. The reference points are different and the coordinates of the geographical location are also different.

(2) Determine the appropriate _______ based on the specific problem and mark _______ on the coordinate axis.

(3) Draw these points in the coordinate plane, and write the _______ of each point and the _______ of each location.

Precautions:

1. Determine the coordinate origin:

When using coordinates to represent a geographical location, attention should be paid to selecting an appropriate location as the origin of the coordinates. The appropriate location mentioned here is usually either a more famous location or a more central location within the area to be drawn. Different origins produce different coordinates of geographical locations. The origin is different and the coordinates of the geographical location are also different. Representing the origin at an appropriate position can reduce the difficulty of calculation.

2. How to determine the direction of the x-axis and y-axis:

The direction of the coordinate axis is usually to take the horizontal line as the x-axis, right as the positive direction (due east), vertical line as the y-axis, and upward as the positive direction (true north), so that the directions of east-west, north-south and Geographical orientation remains consistent.

3. How to determine the distance and unit length on the map:

(1) The scale should be determined according to actual needs;

(2) Distance on the map = actual distance X scale;

(3) Pay attention to marking the scale bar and the unit length on the coordinate axis.

4. Names of various places

Sometimes, because the locations are concentrated and the coordinate plane is small, the names of each location can be marked with a code (such as: A) on the map, and a legend is attached to the map.

induction

The process of using the plane rectangular coordinate system to draw a plan map of the distribution of some locations in the area is as follows:

(1) Establish a coordinate system, select an appropriate reference point as the origin, and determine the positive directions of the X-axis and y-axis;

(2) Determine the appropriate scale according to the specific problem and mark the unit length on the coordinate axis;

(3) Draw these points on the coordinate plane, write the coordinates of each point and the name of each location.

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"Using Coordinates to Express Geographical Locations" Plane Cartesian Coordinate System PPT Courseware 3:

"Using Coordinates to Express Geographical Locations" Plane Cartesian Coordinate System PPT Courseware 3 Review and Thoughts 1. What are the characteristics of the coordinates of points on the coordinate axis? The ordinate of a point on the horizontal axis is 0 and is expressed as (x, 0). The abscissa of a point on the ordinate is 0. It is expressed as (0, y). The origin of...

"Using Coordinates to Represent Geographical Locations" Plane Cartesian Coordinate System PPT Courseware 2:

"Using Coordinates to Express Geographical Locations" Plane Cartesian Coordinate System PPT Courseware 2 Do you know: What are the general processes of using a plane Cartesian coordinate system to express geographical location? 1. Establish an appropriate coordinate system; 2. Determine an appropriate scale and mark the unit length; 3...

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Update Time: 2024-09-26

This template belongs to Mathematics courseware People's Education Press Seventh Grade Mathematics Volume 2 industry PPT template

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