I have used a formula to create an X and Y coordinate that I would like to create a point from. They are held in the attribute table, and I don't know how to use those points for the geometry. Here's the code:
cursor01 = arcpy.da.InsertCursor(OutPutCent,["SHAPE#X", "SHAPE#Y","Xcoord","Ycoord","totpop", "NAME","STATE_NAME","POLY_ID", "OBJECTID", "STATE_FIPS", "CNTY_FIPS", "FIPS", "FIPSnum","FIPS_NUMER" ])
#if row[0] >= 5.2:
cursor01.insertRow([XPoint,YPoint,centroid_X1,centroid_Y1,TotalPop1,thecntyName1,TheStateName1,idpoly1, idobject1, stateFIPS1, countyFIPS1, fips1, fipSnum1, fipsNumer1])
Any suggestions would be much appreciated I need to resolve this asap!
Best
This should probably be in gis.stackexchange.com.
Hard to tell what you're aiming for with that code, but I'll have a guess anyway...If you have existing points you want to relocate based on updated coordinates in an attribute table, try one of the following.
The simple no-scripting solution is this:
export your attribute table to csv
use Add XY Data to import the csv as a new layer
During the import process you can set the geometry to your Xcoord, Ycoord attribute fields, so the new dataset will have updated locations. Then just prune any records you don't want - looks like you're filtering on some value? Select by Attributes and delete rows that don't meet your condition.
Alternatively, a structurally correct template to update existing geometry with new coordinates from the attibute table is:
with arcpy.da.UpdateCursor(dataset, ['SHAPE#XY', 'point_unique_id_or_name', 'conditional_field', 'X_coord', 'Y_coord']) as cursor:
update_count = 0
for row in cursor:
if row[conditional_field_index] meets condition:
updated_point = (row[X_coord_index], row[Y_coord_index])
row[SHAPE#XY_index] = updated_point
cursor.updateRow(row)
print "{} location updated".format(row[point_unique_id_or_name_index])
update_count += 1
print "{} point locations updated".format(update_count)
You only need to reference relevant fields in the UpdateCursor - if they don't get referenced inside the for loop, don't include them.
Strongly advise you practice on a copy of your original dataset.
you need to import QPoint from QtCore:
from PyQt5.QtCore import QPoint
Then create a qpoint object:
_qpoint = QPoint()
Then add your desired x and y coordinates with the setX, and setY methods:
_qpoint.setX()
_qpoint.setY()
example:
_qpoint.setX(500)
_qpoint.setY(700)
beware of the capital X and Y in the 'set' method of the point object.
For more details, refer to this link.
Related
firstly apologies: I am a beginner in Earth Engine, but googling my question hasn't yielded any results. I have a reasonable amount of experience with other languages/platforms.
I have a table of data with headers 'name' and 'value' with N entries, I also have a multiband images in which the bands are named the same as the 'name' column in my table.
I want to apply a functions to each band in the image, based on its corresponding value in the table.
I'm struggling to find a way to do this without using loops and getInfo(), both of which I understand are not efficient and generally frowned upon.
I think perhaps I'm missing something fundamental here regarding the interaction between local variables and things occuring serverside - help would be greatly appreciated!
You could perhaps iterate over the band names in the image:
var updatedImage = ee.Image(
image.bandNames().iterate(
function (bandName, acc) {
bandName = ee.String(bandName) // Must cast from ee.Element to actual type
var feature = features
.filter(ee.Filter.eq('name', bandName))
.first()
var value = feature.getNumber('value')
var bandWithFunctionApplied = image.select(bandName)
.add(value) // Apply some function
return ee.Image(acc)
.addBands(bandWithFunctionApplied)
},
ee.Image([])
)
)
https://code.earthengine.google.com/082411908a7525a4c8a87916b5ea88fc
I have a dictionary of phone numbers where number is Key and country is value. I want to update the key and add country code based on value country. I tried to use the map function for this:
print('**Exmaple: Update phone book to add Country code using map function** ')
user=[{'952-201-3787':'US'},{'952-201-5984':'US'},{'9871299':'BD'},{'01632 960513':'UK'}]
#A function that takes a dictionary as arg, not list. List is the outer part
def add_Country_Code(aDict):
for k,v in aDict.items():
if(v == 'US'):
aDict[( '1+'+k)]=aDict.pop(k)
if(v == 'UK'):
aDict[( '044+'+k)]=aDict.pop(k)
if (v == 'BD'):
aDict[('001+'+k)] =aDict.pop(k)
return aDict
new_user=list(map(add_Country_Code,user))
print(new_user)
This works partially when I run, output below :
[{'1+952-201-3787': 'US'}, {'1+1+1+952-201-5984': 'US'}, {'001+9871299': 'BD'}, {'044+01632 960513': 'UK'}]
Notice the 2nd US number has 2 additional 1s'. What is causing that?How to fix? Thanks a lot.
Issue
You are mutating a dict while iterating it. Don't do this. The Pythonic convention would be:
Make a new_dict = {}
While iterating the input a_dict, assign new items to new_dict.
Return the new_dict
IOW, create new things, rather than change old things - likely the source of your woes.
Some notes
Use lowercase with underscores when defining variable names (see PEP 8).
Lookup values rather than change the input dict, e.g. a_dict[k] vs. a_dict.pop(k)
Indent the correct number of spaces (see PEP 8)
I have a problem when reading DICOM file. This is the format 1.2.840.10008.1.2.4.70(Process 14 with a first-order prediction (Selection Value 1). I write my own software.
Here is result of my work.
I also give you a .dcm file.
What can be wrong with it? Only RadiAnt Dicom Viewer open it corectly ( i didn't find any working software with source code ).
Have someone any tutorial about it? Any working code?
I'll be very grateful!
Thanks for help.
I show you how I it do:
//I have:
numCOL= imageWidth;
numROW= imageHeight;
dwCurrentBufferLength;//-> where I in file
//and other stuff...
//First i decode first row:
//[0][0]
DecodeFirstRow(curRowBuf,dwCurrentBufferLength);
//I calculate difrences
HuffDecode ( table , &val, dwCurrentBufferLength);
//and extend
HuffExtend(extend, val);
curRowBuf[0][curComp]=extend+(1<<(Pr-Pt-1));
//[1-n][0]
//... huff stuff
curRowBuf[col][curComp]=extend+curRowBuf[col-1][curComp];
//Then i put row to the vector:
for (col = 0; col < numCol; col++)
{
v=RowBuf[col][0]<<point_transform_parameter;
m_vOutputBuf.push_back(v);
}
//Rest of columns
//[0][m]
curRowBuf[0][curComp]=extend+prevRowBuf[0][curComp];
predictor = left =curRowBuf[leftcol][curComp];
//[1-n][m]
curRowBuf[col][curComp]=extend+predictor;
//and also put it to vector ^^
Where i must sub this 1000??
Most likely you have not accounted for the Rescale Intercept, tag (0028,1052) when calculating your HU values. According to the DICOM file, the intercept is -1000.
To get the appropriate HU values of your image, use this formula:
HU = rescale_slope * pixel_value + rescale_intercept
where Rescale Intercept is thus obtained from tag (0028,1052) and Rescale Slope from tag (0028,1053).
Here is what I see using gdcmviewer:
$ gdcmviewer 3DSlice1.dcm
GDCM is open source you could study it.
I have 2 possibilities. It looks like these are the same (or I'm wrong). Which is better and why?
var quest1:DisplayObject = FrameCanvas.baseCanvas.addChild(app.questionmark1); //
quest1.x = posX; //
quest1.y = posY; //
or
app.questionmark1.x = posX;
app.questionmark1.y = posY;
In the first example quest1 is a reference to app.questionmark1 which you are adding to FrameCanvas.baseCanvas and then updating its x and y.
In the second example you are directly setting the x and y on app.questionmark1.
Both work to update app.questionmark1's x and y properties, but in the second example app.questionmark1 may not be on the stage unless you added it somewhere else in the code.
The second example is better because there's really not a reason to store a reference to app.questionmark1 as quest1 as you already can access it by app.questionmark1.
I'm creating a table that displays information from a MySQL database, I'm using foreignkeys all over the place to cross-reference data.
Basically I have a datagrid with a column named 'system.' The system is an int that represents the id of an object in another table. I've used lableFunction to cross-reference the two and rename the column. But now sorting doesn't work, I understand that you have to create a custom sorting function. I have tried cross-referencing the two tables again, but that takes ~30sec to sort 1200 rows. Now I'm just clueless as to what I should try next.
Is there any way to access the columns field label inside the sort function?
public function order(a:Object,b:Object):int
{
var v1:String = a.sys;
var v2:String = b.sys;
if ( v1 < v2 ){
trace(-1);
return -1;
}else if ( v1 > v2 ){
trace(1);
return 1;
}else {
trace(0);
return 0;
}
}
One way to handle this is to go through the objects you received and add the label as a property on each of them based on the cross-referenced id. Then you can specify your label property to display in your data grid column instead of using a label function. That way you would get sorting as you'd expect rather than having to create your own sort function.
The way that DataGrids, and other list based classes work is by using itemRenderers. Renderers are only created for the data that is shown on screen. In most cases there is a lot more data in your dataProvider than what is seen on screen.
Trying to sort your data based on something displayed by the dataGrid will most likely not give you the results you want.
But, there is no reason you can't call the same label function on your data objects in the sortFunction.
One way is to use the itemToLabel function of the dataGrid:
var v1:String = dataGrid.itemToLabel(a);
var v2:String = dataGrid.itemToLabel(b);
A second way is to just call the labelFunction explicitly:
var v1:String = labelFunction(a);
var v2:String = = labelFunction(b);
In my experience I have found sorting to be extremely quick, however you're recordset is slightly larger than what I usually load in memory at a single time.